chore(deps): update actions/checkout action to v6 (#18)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/bot-signoff.yaml

@@ -44,7 +44,7 @@ jobs:
           private-key: ${{ secrets.TERO_BOT_PRIVATE_SIGNING_KEY }}
           owner: ${{ github.repository_owner }}
 
-      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
         with:
           token: ${{ steps.generate-token.outputs.token }}
           ref: ${{ github.head_ref || github.ref }}

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
   goreleaser:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
         with:
           fetch-depth: 0