ci: bump actions/checkout from 4 to 5 (#1838)

Link: https://github.com/nix-community/stylix/pull/1838

Signed-off-by: dependabot[bot] <support@github.com>
Reviewed-by: NAHO <90870942+trueNAHO@users.noreply.github.com>

.github/workflows/backport.yml

@@ -36,7 +36,7 @@ jobs:
           permission-contents: write
           permission-pull-requests: write
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           ref: ${{ github.event.pull_request.head.sha }}
           token: ${{ steps.app-token.outputs.token }}

.github/workflows/check.yml

@@ -30,7 +30,7 @@ jobs:
             runs-on: macos-13
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           persist-credentials: false
 

.github/workflows/doc.yml

@@ -24,7 +24,7 @@ jobs:
       url: ${{ steps.deployment.outputs.page_url }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           persist-credentials: false
 

.github/workflows/request-reviewers.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-24.04
     if: vars.APP_ID
     steps:
-      - uses: actions/checkout@v4.2.2
+      - uses: actions/checkout@v5
         with:
           ref: ${{ github.base_ref }}
 

.github/workflows/update-flake.yml

@@ -14,7 +14,7 @@ jobs:
       matrix:
         branch: [master, release-25.05]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           ref: ${{ matrix.branch }}