Bump actions/checkout from 3.6.0 to 4.0.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 3.6.0 to 4.0.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3.6.0...v4.0.0)

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

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

.github/workflows/cron.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.0.0
 
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@master
@@ -38,7 +38,7 @@ jobs:
 
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.0.0
 
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@master

.github/workflows/gitlint.yml

@@ -6,7 +6,7 @@ jobs:
   commit-lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3.6.0
+      - uses: actions/checkout@v4.0.0
         with:
           fetch-depth: 0
       - uses: actions/setup-python@v4

.github/workflows/msrv.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.0.0
 
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@master
@@ -45,7 +45,7 @@ jobs:
           - nightly
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.0.0
 
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@master
@@ -77,7 +77,7 @@ jobs:
           - beta
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.0.0
 
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@master
@@ -99,7 +99,7 @@ jobs:
           - stable
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.0.0
 
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@master
@@ -122,7 +122,7 @@ jobs:
 
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.0.0
 
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@master