Update CI workflows to include actions/checkout@v4 in both ci.yml and release.yml; remove redundant checkout step from ci-checks action.yml for improved efficiency.

Author: Zoomish

.github/actions/ci-checks/action.yml

@@ -4,7 +4,6 @@ description: go test, vet, regenerate gen/, and verify gen/ matches commit
 runs:
   using: composite
   steps:
-    - uses: actions/checkout@v4
     - uses: actions/setup-go@v5
       with:
         go-version-file: go.mod

.github/workflows/ci.yml

@@ -18,4 +18,5 @@ jobs:
   checks:
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/checkout@v4
       - uses: ./.github/actions/ci-checks

.github/workflows/release.yml

@@ -12,6 +12,7 @@ jobs:
   ci:
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/checkout@v4
       - uses: ./.github/actions/ci-checks
 
   publish: