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

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

lib/forge-std/.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
           - --use solc:0.6.2
           - --use solc:0.6.12
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - uses: foundry-rs/foundry-toolchain@v1
@@ -59,7 +59,7 @@ jobs:
       matrix:
         toolchain: [stable, nightly]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - uses: foundry-rs/foundry-toolchain@v1
@@ -74,7 +74,7 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - uses: foundry-rs/foundry-toolchain@v1
@@ -87,7 +87,7 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - uses: crate-ci/typos@80c8a4945eec0f6d464eaf9e65ed98ef085283d1 # v1
@@ -107,7 +107,7 @@ jobs:
             build-mode: none
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           persist-credentials: false
       - name: Initialize CodeQL

lib/forge-std/.github/workflows/sync.yml

@@ -15,7 +15,7 @@ jobs:
     if: startsWith(github.event.release.tag_name, 'v1')
     steps:
       - name: Check out the repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           persist-credentials: true
           fetch-depth: 0