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

Author: renovate[bot]

.github/workflows/linters.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out code into the Go module directory
-        uses: actions/checkout@v1
+        uses: actions/checkout@v6
 
       - name: Run Commitsar
         uses: docker://outillage/commitsar

.github/workflows/release.yml

@@ -10,14 +10,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out code
-        uses: actions/checkout@v1
+        uses: actions/checkout@v6
 
       - name: Set up Go 1.13
         uses: actions/setup-go@v6
         with:
           go-version: 1.13
       - name: Check out code into the Go module directory
-        uses: actions/checkout@v1
+        uses: actions/checkout@v6
 
       - name: Release Notary
         uses: docker://outillage/release-notary

.github/workflows/test.yml

@@ -22,6 +22,6 @@ jobs:
         with:
           go-version: ${{ matrix.go-version }}
       - name: Check out code into the Go module directory
-        uses: actions/checkout@v1
+        uses: actions/checkout@v6
       - name: Test
         run: make ci