chore: update all workflow action versions to latest

- actions/checkout: v4/master → v6 (all workflows)
- actions/cache: v4 → v5 (build.yml, build_pr.yml)
- dependabot/fetch-metadata: v1.1.1 → v3.0.0 (auto-approve, auto-merge)
- amannn/action-semantic-pull-request: v5 → v6 (pr-title)
- markdown-links.yml: pin checkout to v6 instead of floating @master

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: robert-hebel-sb

.github/workflows/auto-approve.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
       - name: Dependabot metadata
         id: metadata
-        uses: dependabot/fetch-metadata@v1.1.1
+        uses: dependabot/fetch-metadata@v3.0.0
         with:
           github-token: '${{ secrets.GITHUB_TOKEN }}'
       - name: Approve a PR

.github/workflows/auto-merge-dependabot.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
       - name: Dependabot metadata
         id: metadata
-        uses: dependabot/fetch-metadata@v1.1.1
+        uses: dependabot/fetch-metadata@v3.0.0
         with:
           github-token: '${{ secrets.GITHUB_TOKEN }}'
       - name: Enable auto-merge for Dependabot PRs

.github/workflows/build.yml

@@ -10,7 +10,7 @@ jobs:
     steps:
     - uses: actions/checkout@v6
     - name: restore_cache
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         key: yarn-packages-${{ github.ref_name }}-${{ hashFiles('yarn.lock') }}
         path: node_modules/

.github/workflows/build_pr.yml

@@ -8,9 +8,9 @@ jobs:
     container:
       image: node:24.14
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: restore_cache
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         key: yarn-packages-${{ github.ref_name }}-${{ hashFiles('yarn.lock') }}
         path: node_modules/
@@ -31,7 +31,7 @@ jobs:
       executor: docker-harness
       install_manually: true
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Install Python and required packages
         run: |
           apt-get update

.github/workflows/markdown-links.yml

@@ -9,7 +9,7 @@ jobs:
   markdown-link-check:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@master
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 1
     - uses: gaurav-nelson/github-action-markdown-link-check@v1

.github/workflows/pr-title.yml

@@ -14,6 +14,6 @@ jobs:
   main:
     runs-on: ubuntu-latest
     steps:
-      - uses: amannn/action-semantic-pull-request@v5
+      - uses: amannn/action-semantic-pull-request@v6
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/release.yml

@@ -19,7 +19,7 @@ jobs:
       tag_name: ${{ steps.release.outputs.tag_name }}
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0