Bump/rationalise docker engine test versions to LTS releases

Author: chadlwilson

.github/workflows/pr_workflow.yml

@@ -12,7 +12,7 @@ jobs:
       matrix:
         docker-version: # See https://endoflife.date/docker-engine / https://download.docker.com/linux/static/stable/x86_64/
           - "v25.0.5"  # 2024-01 --> EOL ?
-          - "v28.3.2"  # 2025-04 --> EOL ?
+          - "v28.3.1"  # 2025-04 --> EOL ?
       fail-fast: false
     steps:
       - name: Harden the runner (Audit all outbound calls)

.github/workflows/test_and_build.yml

@@ -14,7 +14,7 @@ jobs:
       matrix:
         docker-version: # See https://endoflife.date/docker-engine / https://download.docker.com/linux/static/stable/x86_64/
           - "v25.0.5"  # 2024-01 --> EOL ?
-          - "v28.3.2"  # 2025-04 --> EOL ?
+          - "v28.3.1"  # 2025-04 --> EOL ?
       fail-fast: false
     steps:
       - name: Harden the runner (Audit all outbound calls)