Revert "try changing runner due to running out of disk space"

This reverts commit 068a6cd.

Author: Bavier, Andy

.github/workflows/post-merge.yml

@@ -14,7 +14,6 @@ on:
 
 jobs:
   post-merge:
-    runs-on: ubuntu-24.04-4core-16GB
     uses: open-edge-platform/orch-ci/.github/workflows/post-merge.yml@main
     with:
       run_build: true

.github/workflows/pre-merge.yml

@@ -14,7 +14,6 @@ on:
 
 jobs:
   pre-merge:
-    runs-on: ubuntu-24.04-4core-16GB
     uses: open-edge-platform/orch-ci/.github/workflows/pre-merge.yml@main
     with:
       run_security_scans: true