Pin dependencies (#29946)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/tests.yml

@@ -39,12 +39,12 @@ jobs:
                 runner: [1, 2]
         steps:
             - name: Checkout code
-              uses: actions/checkout@v4
+              uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
               with:
                   repository: ${{ inputs.matrix-js-sdk-sha && 'element-hq/element-web' || github.repository }}
 
             - name: Yarn cache
-              uses: actions/setup-node@v4
+              uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
               with:
                   node-version: "lts/*"
                   cache: "yarn"
@@ -55,7 +55,7 @@ jobs:
                   JS_SDK_GITHUB_BASE_REF: ${{ inputs.matrix-js-sdk-sha }}
 
             - name: Jest Cache
-              uses: actions/cache@v4
+              uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4
               with:
                   path: /tmp/jest_cache
                   key: ${{ hashFiles('**/yarn.lock') }}
@@ -84,7 +84,7 @@ jobs:
 
             - name: Upload Artifact
               if: env.ENABLE_COVERAGE == 'true'
-              uses: actions/upload-artifact@v4
+              uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
               with:
                   name: coverage-${{ matrix.runner }}
                   path: |