[Github] Hash Pin Remaining Workflows

There were a couple workflows that were not hash pinning some of their
action dependencies. This ensures that we are following our own CI best
practices: https://llvm.org/docs/CIBestPractices.html.

Author: boomanaiden154

.github/workflows/ci-python-unit.yml

@@ -15,8 +15,8 @@ jobs:
     if: github.repository_owner == 'llvm'
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v4
-    - uses: actions/setup-python@v6
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+    - uses: actions/setup-python@e797f83bcb11b83ae66e0230d6156d7c80228e7c # v6.0.0
       with:
         python-version: '3.14'
         cache: 'pip'

.github/workflows/litmus-tests.yml

@@ -15,7 +15,7 @@ jobs:
     if: github.repository_owner == 'llvm'
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
     - name: Install dependencies
       run: |
         sudo apt-get update

.github/workflows/tf-formatting.yml

@@ -15,7 +15,7 @@ jobs:
     if: github.repository_owner == 'llvm'
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
     - name: Install Dependencies
       run: |
         sudo apt-get update