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

Author: renovate[bot]

.github/workflows/check-for-aqua.yaml

@@ -22,7 +22,7 @@ jobs:
           - macos-latest
           - windows-latest
     steps:
-      - uses: 'actions/checkout@v4'
+      - uses: 'actions/checkout@v6'
       - uses: aquaproj/aqua-installer@11dd79b4e498d471a9385aa9fb7f62bb5f52a73c # v4.0.4
         with:
           aqua_version: v2.43.1

.github/workflows/release.yml

@@ -35,7 +35,7 @@ jobs:
           - name: windows
             vm: windows-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Cache Nim resources
         id: cache_nim
         uses: actions/cache@v4

.github/workflows/test.yml

@@ -19,7 +19,7 @@ jobs:
         nim-version:
           - '2.0.0'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Cache Nim resources
         id: cache_nim
         uses: actions/cache@v4