chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/client_update.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - name: Fetch Changes
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0 # Checkout everything to get access to the tags
           ref: main

.github/workflows/lint.yml

@@ -10,7 +10,7 @@ jobs:
     name: lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-go@v6
         with:
           go-version: '1.24'

.github/workflows/main.yml

@@ -8,7 +8,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-go@v6
         with:
           go-version: '1.24'
@@ -22,7 +22,7 @@ jobs:
     needs: [test]
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Docker meta
       id: meta
       uses: docker/metadata-action@v5

.github/workflows/test_migration.yml

@@ -24,7 +24,7 @@ jobs:
           MYSQL_ROOT_PASSWORD: super_secret_passw0rd
           MYSQL_DATABASE: campus_db
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-go@v6
         with:
           go-version: '1.24'