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](https://github.com/actions/checkout/compare/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>

.github/workflows/ci.yml

@@ -36,7 +36,7 @@ jobs:
       MYSQL_VERSION: '5.7'
       MMSOURCE_VERSION: '1.12'
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           submodules: recursive
           path: sourcemod

.github/workflows/mocktest.yml

@@ -12,20 +12,20 @@ jobs:
   mock:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         name: Clone sourcemod
         with:
           submodules: recursive
           path: sourcemod
       
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         name: Clone metamod-source
         with:
           repository: alliedmodders/metamod-source
           submodules: recursive
           path: metamod-source
       
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         name: Clone hl2sdk-mock
         with:
           repository: alliedmodders/hl2sdk-mock

.github/workflows/scripting.yml

@@ -25,7 +25,7 @@ jobs:
     env:
       ARCH: x86,x86_64
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           submodules: recursive
 

.github/workflows/translations.yml

@@ -10,7 +10,7 @@ jobs:
   update_translations:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           submodules: recursive
 

.github/workflows/translations_sanitycheck.yml

@@ -15,7 +15,7 @@ jobs:
   check_translations:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v6
         name: Setup Python 3.10