chore: pin CI actions

Author: mxmehl

.github/workflows/reuse.yml

@@ -14,6 +14,6 @@ jobs:
   reuse:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
       - name: Check REUSE Compliance
-        uses: fsfe/reuse-action@676e2d560c9a403aa252096d99fcab3e1132b0f5 # v6
+        uses: fsfe/reuse-action@676e2d560c9a403aa252096d99fcab3e1132b0f5 # v6.0.0

.github/workflows/selftest.yml

@@ -27,7 +27,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout code
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
       - name: Build website
         run: |
@@ -42,7 +42,7 @@ jobs:
           echo "baz" > dist/foobar.html
 
       - name: Upload artifact
-        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.0.0
         with:
           name: website
           path: dist
@@ -53,7 +53,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout code
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
       - name: Call action locally
         uses: ./
         with:

action.yml

@@ -215,7 +215,7 @@ runs:
     # ARTIFACT DOWNLOAD
     # ----------------------------------------------------------------------------------------------
     - name: Download Artifact
-      uses: actions/download-artifact@634f93cb2916e3fdff6788551b99b062d0335ce0 # v5
+      uses: actions/download-artifact@634f93cb2916e3fdff6788551b99b062d0335ce0 # v5.0.0
       if: env.IS_PRODUCTION == 'true' || env.IS_PREVIEW == 'true'
       with:
         name: ${{ inputs.artifact_name }}
@@ -299,7 +299,7 @@ runs:
     # ----------------------------------------------------------------------------------------------
     - name: Run Link Checker
       if: ${{ inputs.linkchecker_enabled == 'true' && (env.IS_PRODUCTION == 'true' || env.IS_PREVIEW == 'true' ) }}
-      uses: lycheeverse/lychee-action@885c65f3dc543b57c898c8099f4e08c8afd178a2 # v2
+      uses: lycheeverse/lychee-action@885c65f3dc543b57c898c8099f4e08c8afd178a2 # v2.6.1
       with:
         args: >-
           -r ${{ inputs.linkchecker_retry_times }}