Opt into Node.js 24 for GitHub Actions runners

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

Author: petrsvihlik

.github/workflows/dotnet-core.yml

@@ -8,6 +8,9 @@ on:
   pull_request:
     branches: [ master ]
 
+env:
+  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
+
 jobs:
   build:
 

.github/workflows/lighthouse.yml

@@ -4,6 +4,9 @@ on:
   push:
     branches: [ gh-pages ]
 
+env:
+  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
+
 jobs:
   lighthouse:
     runs-on: ubuntu-latest