Bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/cd.installer.yml

@@ -15,7 +15,7 @@ jobs:
     if: github.repository == 'pkgxdev/mash'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: aws-actions/configure-aws-credentials@v4
         with:

.github/workflows/cd.www.yml

@@ -23,7 +23,7 @@ jobs:
     if: github.repository == 'pkgxdev/mash'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: pkgxdev/setup@v4
 
       - name: trawl

.github/workflows/cd.yml

@@ -17,7 +17,7 @@ jobs:
     if: github.repository == 'pkgxdev/mash'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: fischerscode/tagger@v0
         with:
           prefix: v
@@ -29,7 +29,7 @@ jobs:
     if: github.repository == 'pkgxdev/mash'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: version
         run: sed -i "s/mash 0.0.0-dev/mash ${{ github.event.release.tag_name }}/g" ./mash

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ jobs:
     if: github.repository == 'pkgxdev/mash'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: pkgxdev/setup@v4
       - run: ./mash demo test-pattern
       - run: ./mash demo test-pattern           # check cache route works too