Bump actions/checkout from 5 to 6 (#1885)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/burn_cell.yml

@@ -5,7 +5,7 @@ jobs:
   burn_cell:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

.github/workflows/burn_cell_metal_chem.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

.github/workflows/burn_cell_primordial_chem.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

.github/workflows/burn_cell_sdc.yml

@@ -5,7 +5,7 @@ jobs:
   burn_cell_sdc:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

.github/workflows/c-linter.yml

@@ -6,7 +6,7 @@ jobs:
   cpp-linter:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

.github/workflows/castro-development.yml

@@ -11,15 +11,15 @@ jobs:
     name: Castro development
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Download Castro
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         repository: 'AMReX-Astro/Castro'
         ref: development
         path: 'Castro'
     - name: Download AMReX
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         repository: 'AMReX-Codes/amrex'
         ref: development

.github/workflows/castro.yml

@@ -11,19 +11,19 @@ jobs:
     name: Castro
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Get Latest Release Tag
       run: |
         AMREX_TAG=$(wget https://github.com/AMReX-Codes/amrex/releases/latest 2>&1 | grep Location: | awk '{print $2}' | awk -F/ '{print $NF}')
         echo "AMREX_TAG=$AMREX_TAG" >> $GITHUB_ENV
     - name: Download Castro
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         repository: 'AMReX-Astro/Castro'
         ref: development
         path: 'Castro'
     - name: Download AMReX
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         repository: 'AMReX-Codes/amrex'
         ref: ${{env.AMREX_TAG}}

.github/workflows/check-ifdefs.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

.github/workflows/check_powi.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

.github/workflows/clang-tidy.yml

@@ -10,7 +10,7 @@ jobs:
   clang_tidy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Get AMReX
         run: |