Bump actions/checkout from 3 to 4 (#3320)

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

Author: dependabot[bot]

.github/workflows/build_artifacts.yml

@@ -27,7 +27,7 @@ jobs:
       solution: MaterialDesignToolkit.Full.sln
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Setup .NET
         uses: actions/setup-dotnet@v3

.github/workflows/control_styles.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Generate Control Styles Markdown
       run: Scripts/GenerateThemesWikiMarkdown.ps1
       shell: pwsh

.github/workflows/icon_update.yml

@@ -20,7 +20,7 @@ jobs:
     runs-on: windows-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Setup .NET
       uses: actions/setup-dotnet@v3

.github/workflows/release.yml

@@ -85,7 +85,7 @@ jobs:
     name: Get Icon Changes
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
@@ -150,7 +150,7 @@ jobs:
 
     steps:
       - name: Checkout Wiki Repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository:  ${{ github.repository }}.wiki
 
@@ -246,7 +246,7 @@ jobs:
     steps:
       # Doing a checkout, until this issue is resolved.
       # https://github.com/valeriobelli/gh-milestone/issues/15
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Close Milestone
         run: |
@@ -266,7 +266,7 @@ jobs:
 
     steps:
       # Checkout is needed so that we can update the get_versions.yml file
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Increment Version Numbers
         run: |