Update dependency docker/setup-docker-action to v29

Author: govuk-ci

.github/workflows/build-and-push-multiarch-image.yml

@@ -63,7 +63,7 @@ jobs:
     steps:
       - uses: docker/setup-docker-action@b2189fbf2a6592b51fee7cdd93ee2bfaeba733db # v5.1.0
         with:
-          version: "version=28.5.2"
+          version: "v29.5.2"
 
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
@@ -135,7 +135,7 @@ jobs:
     steps:
       - uses: docker/setup-docker-action@b2189fbf2a6592b51fee7cdd93ee2bfaeba733db # v5.1.0
         with:
-          version: "version=28.5.2"
+          version: "v29.5.2"
 
       - name: Download Digests
         uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1