Upgrade actions/checkout and actions/cache to Node.js 24 compatible versions

Node.js 20 is being forced to Node.js 24 on June 16th 2026 and removed
September 16th 2026. Upgrade to latest releases ahead of the deadline.

actions/checkout v4.3.1 → v6.0.3 (df4cb1c069e1874edd31b4311f1884172cec0e10)
actions/cache v4.3.0   → v5.0.5 (27d5ce7f107fe9357f9df03efb73ab90386fccae)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: carlbennett

.github/workflows/ci-cd.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
 
       - name: Update apt cache
         run: sudo apt-get update
@@ -39,7 +39,7 @@ jobs:
 
       - name: Cache Composer packages
         id: composer-cache
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
+        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
         with:
           path: lib
           key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
@@ -57,7 +57,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
 
       - name: Update apt cache
         run: sudo apt-get update
@@ -71,7 +71,7 @@ jobs:
 
       - name: Cache Composer packages
         id: composer-cache
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
+        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
         with:
           path: lib
           key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
@@ -91,7 +91,7 @@ jobs:
     environment: production
     steps:
       - name: Checkout Code
-        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
         with:
           fetch-depth: 0 # Everything
           fetch-tags: true
@@ -108,7 +108,7 @@ jobs:
 
       - name: Cache Composer packages
         id: composer-cache
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
+        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
         with:
           path: lib
           key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}