ci: Update action versions

Author: a.b.christie

.github/workflows/build-tag.yaml

@@ -38,9 +38,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - name: Inject slug/short variables
-      uses: rlespinasse/github-slug-action@v4
+      uses: rlespinasse/github-slug-action@v5
     - name: Login to DockerHub
       uses: docker/login-action@v3
       with: