Bump actions/checkout from 3 to 4 (#88)

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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ci.yml

@@ -46,7 +46,7 @@ jobs:
         destination: ["test_ios15", "test_tvos15","test_macos", "build_watchos"]
     steps:
       - name: git checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: ruby setup
         uses: ruby/setup-ruby@v1
         with:
@@ -70,7 +70,7 @@ jobs:
   #       destination: ["test_ios14", "test_tvos14","test_macos", "build_watchos_xcode12"]
   #   steps:
   #     - name: git checkout
-  #       uses: actions/checkout@v3
+  #       uses: actions/checkout@v4
   #     - name: ruby setup
   #       uses: ruby/setup-ruby@v1
   #       with:

.github/workflows/generate-docs.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: macOS-12
     steps:
       - name: git checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: ruby setup
         uses: ruby/setup-ruby@v1

.github/workflows/pod-lint.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: macOS-12
     steps:
       - name: git checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: ruby versions
         run: |

.github/workflows/spm.yml

@@ -25,7 +25,7 @@ jobs:
     runs-on: macOS-12
     steps:
       - name: git checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: xcode version
         run: xcodebuild -version -sdk