Bump actions/checkout from 2 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v2...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/docs.yaml

@@ -24,7 +24,7 @@ jobs:
         run: apk add bash git tar file make build-base sqlite graphviz just
       - 
         name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           fetch-depth: 2 # needed for action-detect-and-tag-new-version
       # - 

.github/workflows/release.yaml

@@ -30,7 +30,7 @@ jobs:
           access_token: ${{ github.token }}
       - 
         name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           fetch-depth: 2 # needed for action-detect-and-tag-new-version
       - 
@@ -116,7 +116,7 @@ jobs:
   #         access_token: ${{ github.token }}
   #     - name: Install git # needed for checkout with fetch-depth
   #       run: apt-get update -q -y && apt-get install -q -y git
-  #     - uses: actions/checkout@v2
+  #     - uses: actions/checkout@v4
   #       with:
   #         fetch-depth: 2 # needed for action-detect-and-tag-new-version
   #     - name: Trust my repo
@@ -200,7 +200,7 @@ jobs:
   #   steps:
   #     - 
   #       name: Checkout
-  #       uses: actions/checkout@v2
+  #       uses: actions/checkout@v4
   #       with:
   #         fetch-depth: 2 # needed for action-detect-and-tag-new-version
   #     - 

.github/workflows/test.yaml

@@ -46,7 +46,7 @@ jobs:
       run: apk add bash git tar file make build-base sqlite just
     - 
       name: Checkout repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
       with:
           fetch-depth: 2 # needed for action-detect-and-tag-new-version
     # - name: Set up Elixir
@@ -129,7 +129,7 @@ jobs:
   #     run: apk add git tar file
   #   - 
   #     name: Checkout repo
-  #     uses: actions/checkout@v2
+  #     uses: actions/checkout@v4
   #     with:
   #         fetch-depth: 2 # needed for action-detect-and-tag-new-version
   #   # - name: Set up Elixir