Bump actions/checkout to v6 not v7

Author: williamdes

.github/workflows/build.yml

@@ -11,7 +11,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - name: Checkout repository
-              uses: actions/checkout@v7
+              uses: actions/checkout@v6
             - name: Build action image
               run: make docker-build
               env:

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - name: Checkout repository
-              uses: actions/checkout@v7
+              uses: actions/checkout@v6
             # https://github.com/docker/setup-qemu-action
             - name: Set up QEMU
               uses: docker/setup-qemu-action@v3

.github/workflows/shellcheck.yml

@@ -9,7 +9,7 @@ jobs:
     check:
         runs-on: ubuntu-latest
         steps:
-            - uses: actions/checkout@v7
+            - uses: actions/checkout@v6
             - name: run shellcheck
               uses: sudo-bot/action-shellcheck@latest
               with:

README.md

@@ -15,7 +15,7 @@ This action has `make` and `bash`.
 ## Example usage
 
 ```yml
-  - uses: actions/checkout@v7
+  - uses: actions/checkout@v6
   - name: run shellcheck
     uses: sudo-bot/action-shellcheck@latest
     with:
@@ -26,7 +26,7 @@ This action has `make` and `bash`.
 ## Advanced usage
 
 ```yml
-  - uses: actions/checkout@v7
+  - uses: actions/checkout@v6
   - name: run shellcheck
     uses: sudo-bot/action-shellcheck@latest
     with: