Revert "release: v9.1.0-next.2"

The commit message is wrong as this should have been `v9.1.0-next.1`. Rolling this back before re-commiting with the correct commit message.

This reverts commit 38152fe.

Author: dgp1130

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

@@ -8,7 +8,7 @@
 
 export const latestVersions = {
   // These versions should be kept up to date with latest Angular peer dependencies.
-  Angular: '~9.1.0-next.2',
+  Angular: '~9.1.0-next.1',
   RxJs: '~6.5.4',
   ZoneJs: '~0.10.2',
   TypeScript: '~3.7.5',
@@ -18,9 +18,9 @@ export const latestVersions = {
   // 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: '~0.901.0-next.1',
-  DevkitBuildNgPackagr: '~0.901.0-next.1',
-  DevkitBuildWebpack: '~0.901.0-next.1',
+  DevkitBuildAngular: '~0.901.0-next.0',
+  DevkitBuildNgPackagr: '~0.901.0-next.0',
+  DevkitBuildWebpack: '~0.901.0-next.0',
 
   ngPackagr: '^9.0.0',
 };