ci: update cz config

Author: liblaf

.cz.yaml

@@ -1,5 +1,4 @@
 commitizen:
-  bump_message: 'ci: bump version $current_version -> $new_version'
   name: cz_conventional_commits
   tag_format: $version
   version: 0.5.0

.github/workflows/bump.yaml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   bump:
-    if: "!startsWith(github.event.head_commit.message, 'ci: bump version')"
+    if: "!startsWith(github.event.head_commit.message, 'bump:')"
     runs-on: ubuntu-latest
     steps:
       - name: Checkout