Bump actions/checkout from 2 to 4 (#1266)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](actions/checkout@v2...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/grammar-validator.yaml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
     - name: Check out our repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Setup .NET 8.0
       uses: actions/setup-dotnet@v4

.github/workflows/markdownlint.yml

@@ -28,7 +28,7 @@ jobs:
         statuses: write
 
     steps:
-    - uses: actions/checkout@24cb9080177205b6e8c946b17badbe402adc938f
+    - uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5
     - name: Use Node.js
       uses: actions/setup-node@64ed1c7eab4cce3362f8c340dee64e5eaeef8f7c
       with:

.github/workflows/renumber-sections.yaml

@@ -24,7 +24,7 @@ jobs:
 
     steps:
     - name: Check out our repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Setup .NET 8.0
       uses: actions/setup-dotnet@v4

.github/workflows/smart-quotes.yaml

@@ -22,7 +22,7 @@ jobs:
 
     steps:
     - name: Check out our repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Setup .NET 8.0
       uses: actions/setup-dotnet@v4

.github/workflows/test-examples.yaml

@@ -26,7 +26,7 @@ jobs:
 
     steps:
     - name: Check out our repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     # We build examples against .NET 6.0, but use
     # 8.0 for the tools themselves. (The closer we

.github/workflows/tools-tests.yaml

@@ -23,7 +23,7 @@ jobs:
 
     steps:
     - name: Check out our repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Setup .NET 8.0
       uses: actions/setup-dotnet@v4

.github/workflows/update-on-merge.yaml

@@ -28,7 +28,7 @@ jobs:
 
     steps:
     - name: Check out our repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Setup .NET 8.0
       uses: actions/setup-dotnet@v4

.github/workflows/word-converter.yaml

@@ -24,7 +24,7 @@ jobs:
 
     steps:
     - name: Check out our repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Setup .NET 8.0
       uses: actions/setup-dotnet@v4