chore(deps): update actions/checkout action to v4 (#19)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/lint.yml

@@ -11,7 +11,7 @@ jobs:
     name: Run linters
     runs-on: macos-12
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Cache Mint packages
         id: mint-cache
         uses: actions/cache@v3

.github/workflows/podspec_lint.yml

@@ -11,7 +11,7 @@ jobs:
     name: Run linters
     runs-on: macos-12
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Cache bundler gems
         uses: actions/cache@v3
         with:

.github/workflows/tests.yml

@@ -18,7 +18,7 @@ jobs:
     name: macOS 12 (Xcode ${{ matrix.xcode }})
     runs-on: macos-12
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Select Xcode ${{ matrix.xcode }}
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app
       - run: swift test