build(deps): bump actions/checkout from 4 to 5

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [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/v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/build.yml

@@ -20,7 +20,7 @@ jobs:
     if: github.repository == 'helix-editor/helix' || github.event_name != 'schedule'
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Install MSRV toolchain
         uses: dtolnay/rust-toolchain@master
@@ -51,7 +51,7 @@ jobs:
       HELIX_LOG_LEVEL: info
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Install MSRV toolchain
         uses: dtolnay/rust-toolchain@master
@@ -85,7 +85,7 @@ jobs:
     if: github.repository == 'helix-editor/helix' || github.event_name != 'schedule'
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Install MSRV toolchain
         uses: dtolnay/rust-toolchain@master
@@ -121,7 +121,7 @@ jobs:
     if: github.repository == 'helix-editor/helix' || github.event_name != 'schedule'
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Install MSRV toolchain
         uses: dtolnay/rust-toolchain@master

.github/workflows/cachix.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout sources
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
 
     - name: Install nix
       uses: cachix/install-nix-action@v31

.github/workflows/gh-pages.yml

@@ -11,7 +11,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Setup mdBook
         uses: peaceiris/actions-mdbook@v2

.github/workflows/release.yml

@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Install stable toolchain
         uses: dtolnay/rust-toolchain@stable
@@ -104,7 +104,7 @@ jobs:
 
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Download grammars
         uses: actions/download-artifact@v4
@@ -235,7 +235,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - uses: actions/download-artifact@v4