build(deps): bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/build.yml

@@ -46,10 +46,10 @@ jobs:
 
     steps:
       - name: Checkout Geany-Plugins
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Checkout Geany
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: geany/geany
           path: ${{ env.GEANY_SOURCE_PATH }}
@@ -213,17 +213,17 @@ jobs:
 
     steps:
       - name: Checkout Geany-Plugins
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Checkout Geany
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: geany/geany
           path: ${{ env.GEANY_SOURCE_PATH }}
           token: ${{ github.token }}
 
       - name: Checkout Build Scripts
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: master
           repository: geany/infrastructure

.github/workflows/windows-msys2-build.yml

@@ -9,9 +9,9 @@ jobs:
         shell: msys2 {0}
     steps:
       - name: Checkout Geany-Plugins
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Checkout Geany
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: geany/geany
           path: .geany_source