ci: update material-unit-tests job commit to latest (#34863)

Updates the `material-unit-tests` job commit to the latest
available commit. We need to update since the `angular/components`
repository updated to TypeScript 3.7, which means that we can remove
the TS 3.7 workarounds we applied to get the job green when framework
updated to TS 3.7.

PR Close #34863

.circleci/config.yml

@@ -29,7 +29,7 @@ var_4_win: &cache_key_win_fallback v5-angular-win-node-12.0-
 
 # Cache key for the Material unit tests job. **Note** when updating the SHA in the cache keys,
 # also update the SHA for the "MATERIAL_REPO_COMMIT" environment variable.
-var_5: &material_unit_tests_cache_key v5-angular-material-71955d2e194bfc5561f25daea16e68af266d6ff9
+var_5: &material_unit_tests_cache_key v5-angular-material-97a7e2babbccd3dc58e7b3364004e45ed5bd9968
 var_6: &material_unit_tests_cache_key_fallback v5-angular-material-
 
 # Workspace initially persisted by the `setup` job, and then enhanced by `build-npm-packages` and

.circleci/env.sh

@@ -75,7 +75,7 @@ setPublicVar MATERIAL_REPO_TMP_DIR "/tmp/material2"
 setPublicVar MATERIAL_REPO_URL "https://github.com/angular/material2.git"
 setPublicVar MATERIAL_REPO_BRANCH "master"
 # **NOTE**: When updating the commit SHA, also update the cache key in the CircleCI "config.yml".
-setPublicVar MATERIAL_REPO_COMMIT "71955d2e194bfc5561f25daea16e68af266d6ff9"
+setPublicVar MATERIAL_REPO_COMMIT "97a7e2babbccd3dc58e7b3364004e45ed5bd9968"
 
 # Source `$BASH_ENV` to make the variables available immediately.
 source $BASH_ENV;