Build/Test Tools: Update third-party GitHub Actions to latest versions.

Updated actions:
- `actions/cache`
- `actions/github-script`
- `actions/setup-node`
- `bubkoo/welcome-action`
- `shivammathur/setup-php`
- `slackapi/slack-github-action`

See #55652.

git-svn-id: https://develop.svn.wordpress.org/trunk@53940 602fd350-edb4-49c9-b593-d223f7449a82

.github/workflows/phpunit-tests.yml

@@ -112,7 +112,7 @@ jobs:
         uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b # v3.0.2
 
       - name: Install NodeJS
-        uses: actions/setup-node@eeb10cff27034e7acf239c5d29f62154018672fd # v3.3.0
+        uses: actions/setup-node@2fddd8803e2f5c9604345a0b591c3020ee971a93 # v3.4.1
         with:
           node-version-file: '.nvmrc'
           cache: npm
@@ -131,7 +131,7 @@ jobs:
         run: echo "::set-output name=dir::$(composer config cache-files-dir)"
 
       - name: Cache Composer dependencies
-        uses: actions/cache@c3f1317a9e7b1ef106c153ac8c0f00fed3ddbc0d # v3.0.4
+        uses: actions/cache@fd5de65bc895cf536527842281bea11763fefd77 # v3.0.8
         env:
           cache-name: cache-composer-dependencies
         with: