build(deps): 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]>

Author: dependabot[bot]

.github/workflows/CI.yml

@@ -28,12 +28,12 @@ jobs:
           - { name: "pango", features: "v1_50", nightly: "--all-features", test_sys: true }
           - { name: "pangocairo", features: "", nightly: "--all-features", test_sys: true }
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: ${{ matrix.rust }}
           override: true
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           repository: gtk-rs/checker
           ref: master
@@ -102,7 +102,7 @@ jobs:
           - nightly
           - "1.70.0"
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: ${{ matrix.rust }}
@@ -126,7 +126,7 @@ jobs:
     name: rust fmt
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
@@ -142,7 +142,7 @@ jobs:
     name: regen check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: recursive
           set-safe-directory: true
@@ -159,7 +159,7 @@ jobs:
     name: docs embed check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: recursive
           set-safe-directory: true

.github/workflows/docs.yml

@@ -22,7 +22,7 @@ jobs:
       RUSTFLAGS: --cfg docsrs
       RUSTDOCFLAGS: --cfg docsrs -Zunstable-options --generate-link-to-definition
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: recursive
           set-safe-directory: true

.github/workflows/typos.yml

@@ -10,6 +10,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Actions Repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Check spelling
         uses: crate-ci/typos@master

.github/workflows/windows.yml

@@ -36,7 +36,7 @@ jobs:
 
       - name: (GTK binaries) checkout gvsbuild
         if: steps.cache.outputs.cache-hit != 'true'
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: wingtk/gvsbuild
           ref: ${{ env.gvsbuildref }}
@@ -107,7 +107,7 @@ jobs:
           echo "C:\gtk-build\gtk\x64\release\bin" >> $GITHUB_PATH
         shell: bash
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: actions-rs/toolchain@v1
         with: