chore(docs): update release calendar for 2.26 mainline release (coder#19680)

Co-authored-by: Atif Ali <atif@coder.com>

Author: stirby

docs/install/kubernetes.md

@@ -135,7 +135,7 @@ We support two release channels: mainline and stable - read the
     helm install coder coder-v2/coder \
         --namespace coder \
         --values values.yaml \
-        --version 2.25.0
+        --version 2.26.0
     ```
 
   - **OCI Registry**
@@ -146,7 +146,7 @@ We support two release channels: mainline and stable - read the
     helm install coder oci://ghcr.io/coder/chart/coder \
         --namespace coder \
         --values values.yaml \
-        --version 2.25.0
+        --version 2.26.0
     ```
 
 - **Stable** Coder release:
@@ -159,7 +159,7 @@ We support two release channels: mainline and stable - read the
     helm install coder coder-v2/coder \
         --namespace coder \
         --values values.yaml \
-        --version 2.25.0
+        --version 2.25.2
     ```
 
   - **OCI Registry**
@@ -170,7 +170,7 @@ We support two release channels: mainline and stable - read the
     helm install coder oci://ghcr.io/coder/chart/coder \
         --namespace coder \
         --values values.yaml \
-        --version 2.25.0
+        --version 2.25.2
     ```
 
 You can watch Coder start up by running `kubectl get pods -n coder`. Once Coder

docs/install/kubernetes/kubernetes-azure-app-gateway.md

@@ -129,7 +129,7 @@ The steps here follow the Microsoft tutorial for a Coder deployment.
    helm install coder coder-v2/coder \
        --namespace coder \
     --values values.yaml \
-    --version 2.18.5
+    --version 2.25.2
    ```
 
 1. Clean up Azure resources:

docs/install/releases/index.md

@@ -55,15 +55,15 @@ pages.
 ## Release schedule
 <!-- Autogenerated release calendar from scripts/update-release-calendar.sh -->
 <!-- RELEASE_CALENDAR_START -->
-| Release name                                   | Release Date    | Status           | Latest Release                                                 |
-|------------------------------------------------|-----------------|------------------|----------------------------------------------------------------|
-| [2.20](https://coder.com/changelog/coder-2-20) | March 04, 2025  | Not Supported    | [v2.20.3](https://github.com/coder/coder/releases/tag/v2.20.3) |
-| [2.21](https://coder.com/changelog/coder-2-21) | April 02, 2025  | Not Supported    | [v2.21.3](https://github.com/coder/coder/releases/tag/v2.21.3) |
-| [2.22](https://coder.com/changelog/coder-2-22) | May 16, 2025    | Security Support | [v2.22.1](https://github.com/coder/coder/releases/tag/v2.22.1) |
-| [2.23](https://coder.com/changelog/coder-2-23) | June 03, 2025   | Security Support | [v2.23.2](https://github.com/coder/coder/releases/tag/v2.23.4) |
-| [2.24](https://coder.com/changelog/coder-2-24) | July 01, 2025   | Stable           | [v2.24.2](https://github.com/coder/coder/releases/tag/v2.24.2) |
-| [2.24](https://coder.com/changelog/coder-2-24) | August 05, 2025 | Mainline         | [v2.25.0](https://github.com/coder/coder/releases/tag/v2.25.0) |
-| 2.25                                           |                 | Not Released     | N/A                                                            |
+| Release name                                   | Release Date       | Status           | Latest Release                                                 |
+|------------------------------------------------|--------------------|------------------|----------------------------------------------------------------|
+| [2.21](https://coder.com/changelog/coder-2-21) | April 02, 2025     | Not Supported    | [v2.21.3](https://github.com/coder/coder/releases/tag/v2.21.3) |
+| [2.22](https://coder.com/changelog/coder-2-22) | May 16, 2025       | Not Supported    | [v2.22.1](https://github.com/coder/coder/releases/tag/v2.22.1) |
+| [2.23](https://coder.com/changelog/coder-2-23) | June 03, 2025      | Security Support | [v2.23.2](https://github.com/coder/coder/releases/tag/v2.23.4) |
+| [2.24](https://coder.com/changelog/coder-2-24) | August 07, 2025    | Security Support | [v2.24.3](https://github.com/coder/coder/releases/tag/v2.24.3) |
+| [2.25](https://coder.com/changelog/coder-2-25) | September 04, 2025 | Stable           | [v2.25.2](https://github.com/coder/coder/releases/tag/v2.25.2) |
+| [2.26](https://coder.com/changelog/coder-2-26) | September 02, 2025 | Mainline         | [v2.26.0](https://github.com/coder/coder/releases/tag/v2.26.0) |
+| 2.27                                           | October 07, 2025   | Not Released     | N/A                                                            |
 <!-- RELEASE_CALENDAR_END -->
 
 > [!TIP]