chore(deps): 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/tech_matrix_prep.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: get current technology matrix
         id: getTechMatrix

.github/workflows/validate.yml

@@ -8,7 +8,7 @@ jobs:
         python-version: [ "3.13" ]
     steps:
       - name: checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v6
@@ -26,7 +26,7 @@ jobs:
         python-version: [ "3.13" ]
     steps:
       - name: checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v6
@@ -47,7 +47,7 @@ jobs:
         python-version: [ "3.13" ]
     steps:
       - name: checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v6
@@ -65,7 +65,7 @@ jobs:
         python-version: [ "3.13" ]
     steps:
       - name: checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v6
@@ -89,7 +89,7 @@ jobs:
         python-version: [ "3.13" ]
     steps:
       - name: checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v6
@@ -109,7 +109,7 @@ jobs:
         python-version: [ "3.13" ]
     steps:
       - name: checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v6