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

Author: renovate[bot]

.github/workflows/bun-test.yml

@@ -12,7 +12,7 @@ jobs:
                 bun: [latest]
 
         steps:
-            - uses: actions/checkout@v5
+            - uses: actions/checkout@v6
             - name: Use Bun ${{ matrix.bun }}
               uses: oven-sh/setup-bun@v2
               with:

.github/workflows/nodejs-test.yml

@@ -18,7 +18,7 @@ jobs:
                 node: [20.x, 22.x, 24.x]
 
         steps:
-            - uses: actions/checkout@v5
+            - uses: actions/checkout@v6
             - name: Use Node.js ${{ matrix.node }}
               uses: actions/setup-node@v6
               with:

.github/workflows/release-please.yml

@@ -19,7 +19,7 @@ jobs:
                   token: ${{ secrets.GITHUB_TOKEN }}
 
             # The logic below handles the npm publication:
-            - uses: actions/checkout@v5
+            - uses: actions/checkout@v6
               # these if statements ensure that a publication only occurs when
               # a new release is created:
               if: ${{ steps.release.outputs.release_created }}