Update checkout action to v4 for consistency with modern GitHub Actions

Co-authored-by: nomeguy <85475922+nomeguy@users.noreply.github.com>

Author: Copilot

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
         with:
           go-version: '1.23.0'
 
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Run Unit tests
         run: go test -v -coverprofile=./profile.cov ./...
 
@@ -33,7 +33,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Run semantic-release
         run: |