Revert "release: v10.0.0-rc.1"

v10.0.0-rc.1 release should not be cut from master branch, it should be
cut from the 10.0.x branch.

This reverts commit e029258.

Author: Keen Yee Liau

packages/schematics/angular/utility/latest-versions.ts

@@ -8,19 +8,19 @@
 
 export const latestVersions = {
   // These versions should be kept up to date with latest Angular peer dependencies.
-  Angular: '~10.0.0-rc.2',
+  Angular: '~10.0.0-rc.0',
   RxJs: '~6.5.4',
   ZoneJs: '~0.10.2',
-  TypeScript: '~3.9.3',
+  TypeScript: '~3.9.2',
   TsLib: '^2.0.0',
 
   // The versions below must be manually updated when making a new devkit release.
   // For our e2e tests, these versions must match the latest tag present on the branch.
   // During RC periods they will not match the latest RC until there's a new git tag, and
   // should not be updated.
-  DevkitBuildAngular: '~0.1000.0-rc.1',
-  DevkitBuildNgPackagr: '~0.1000.0-rc.1',
-  DevkitBuildWebpack: '~0.1000.0-rc.1',
+  DevkitBuildAngular: '~0.1000.0-rc.0',
+  DevkitBuildNgPackagr: '~0.1000.0-rc.0',
+  DevkitBuildWebpack: '~0.1000.0-rc.0',
 
-  ngPackagr: '^10.0.0-rc.0',
+  ngPackagr: '^10.0.0-next.2',
 };