Bump actions/checkout from 5.0.0 to 6.0.0 (#113)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5.0.0 to 6.0.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5.0.0...v6.0.0)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/build.yaml

@@ -9,7 +9,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5.0.0
+      - uses: actions/checkout@v6.0.0
         with:
           # required by release-tag.sh to correctly identify files changed in the last commit
           fetch-depth: 2

.github/workflows/refresh_versions.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: "ubuntu-latest"
     steps:
       - name: check-out
-        uses: actions/checkout@v5.0.0
+        uses: actions/checkout@v6.0.0
         with:
           ref: trunk
       - name: setup-java

.github/workflows/scratchpad.yaml

@@ -7,4 +7,4 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5.0.0
+        uses: actions/checkout@v6.0.0

.github/workflows/upload_release.yaml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5.0.0
+        uses: actions/checkout@v6.0.0
       - name: Grab tag name
         uses: olegtarasov/[email protected]
         id: tagName