kubespray/branch protection: exclude checksum auto update

Kubespray updates the checksums of binaries it deploys with a github
workflow which makes a pull request.

Unprotect the branch used for that purpose.

Author: VannTen

config/prow/config.yaml

@@ -597,6 +597,8 @@ branch-protection:
             gh-pages:
               protect: false
         kubespray:
+          exclude:
+            - "^component_hash_update/" # don't protect PR branches from the checksums updater
           required_status_checks:
             contexts:
             - Kubespray CI Pipeline