Bump actions/checkout from 2 to 3

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v3)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/lint-python.yml

@@ -30,7 +30,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Run the set up script
         id: setup

.github/workflows/lint-shell.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       # Recursively lint all shell scripts in the repository
       # See: https://github.com/azohra/shell-linter/blob/latest/README.md

.github/workflows/spell-check.yml

@@ -8,7 +8,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Spell check
         uses: arduino/actions/libraries/spell-check@master

.github/workflows/sync-labels.yml

@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Download JSON schema for labels configuration file
         id: download-schema
@@ -106,7 +106,7 @@ jobs:
           echo "::set-output name=flag::--dry-run"
 
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Download configuration files artifact
         uses: actions/download-artifact@v2

.github/workflows/test-integration.yml

@@ -28,13 +28,13 @@ jobs:
 
     steps:
       - name: Checkout Servo library
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           repository: arduino-libraries/servo
           ref: 1.1.7
 
       - name: Checkout local repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           # Must be checked out to a subfolder to not interfere with the checked out library under test
           path: extras/compile-sketches
@@ -72,7 +72,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Run action
         # Use action from local path
@@ -166,21 +166,21 @@ jobs:
 
     steps:
       - name: Checkout library
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           repository: arduino-libraries/Servo
           ref: 1.1.7
 
       - name: Checkout platform
         if: matrix.board.source-type == 'path'
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           repository: arduino/ArduinoCore-avr
           ref: 1.8.3
           path: extras/ArduinoCore-avr
 
       - name: Checkout local repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           path: extras/compile-sketches
 
@@ -210,7 +210,7 @@ jobs:
     steps:
       # Checkout is needed to get the golden reports
       - name: Checkout local repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Download sketches reports artifact
         uses: actions/download-artifact@v2
@@ -272,7 +272,7 @@ jobs:
 
     steps:
       - name: Checkout local repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Compile sketch that is expected to error
         id: compile-sketches

.github/workflows/test-python.yml

@@ -37,7 +37,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Run the set up script
         id: setup

.github/workflows/validate-action_yml.yml

@@ -28,7 +28,7 @@ jobs:
 
     steps:
       - name: Checkout local repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       # See: https://github.com/carlosperate/download-file-action/blob/master/README.md
       - name: Download JSON schema for action.yml