Bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/ci.yml

@@ -26,7 +26,7 @@ jobs:
               elixir: "1.12.3"
               otp: "24.3"
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: erlef/setup-beam@v1
         id: beam

.github/workflows/release.yml

@@ -34,7 +34,7 @@ jobs:
 
     steps:
       - name: Checkout source code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - uses: actions/[email protected]
         with:

.github/workflows/rust-ci.yml

@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: Checkout source code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - uses: actions/[email protected]
         with: