chore(deps): update songmu/tagpr action to v1.15.0

Author: renovate[bot]

.github/workflows/wf-tagpr.yml

@@ -15,6 +15,6 @@ jobs:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           token: ${{ steps.app-token.outputs.token }}
-      - uses: Songmu/tagpr@6423eaf899ec18cb0f5ad3e5c3a7482595a62f04 # v1.12.1
+      - uses: Songmu/tagpr@78a926ba835e34721053309043aee696ba9c70b1 # v1.15.0
         env:
           GITHUB_TOKEN: ${{ steps.app-token.outputs.token }}