CI: Hash-pin workflow dependencies, install dependabot for workflows (#19637)

Author: pnacht

.github/dependabot.yml

@@ -0,0 +1,11 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"

.github/workflows/archive.yml

@@ -15,13 +15,13 @@ jobs:
   archive:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # v3.5.3
     - name: make dist
       run: |
         make dist
         version=`cat emscripten-version.txt | sed s/\"//g`
         echo "VERSION=$version" >> $GITHUB_ENV
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@0b7f8abb1508181956e8e162db84b466c27e18ce # v3.1.2
       with:
         name: emscripten-${{ env.VERSION }}
         path: emscripten-${{ env.VERSION }}.tar.bz2

.github/workflows/scorecards.yml

@@ -22,12 +22,12 @@ jobs:
 
     steps:
       - name: "Checkout code"
-        uses: actions/checkout@a12a3943b4bdde767164f792f33f40b04645d846 # tag=v3.0.0
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # v3.5.3
         with:
           persist-credentials: false
 
       - name: "Run analysis"
-        uses: ossf/scorecard-action@3e15ea8318eee9b333819ec77a36aca8d39df13e # tag=v1.1.1
+        uses: ossf/scorecard-action@80e868c13c90f172d68d1f4501dee99e2479f7af # v2.1.3
         with:
           results_file: results.sarif
           results_format: sarif
@@ -42,14 +42,14 @@ jobs:
 
       # Upload the results as artifacts (optional).
       - name: "Upload artifact"
-        uses: actions/upload-artifact@6673cd052c4cd6fcf4b4e6e60ea986c889389535 # tag=v3.0.0
+        uses: actions/upload-artifact@0b7f8abb1508181956e8e162db84b466c27e18ce # v3.1.2
         with:
           name: SARIF file
           path: results.sarif
           retention-days: 5
 
       # Upload the results to GitHub's code scanning dashboard.
       - name: "Upload to code-scanning"
-        uses: github/codeql-action/upload-sarif@5f532563584d71fdef14ee64d17bafb34f751ce5 # tag=v1.0.26
+        uses: github/codeql-action/upload-sarif@6c089f53dd51dc3fc7e599c3cb5356453a52ca9e # v2.20.0
         with:
           sarif_file: results.sarif