fwk: Update github actions lint runner to the latest ubuntu version

BRANCH=fwk-main
BUG=The lint runner started failing and github says 20.04 was turned off April 15, 2025
TEST=lint action can run

(cherry picked from commit 915ff26d34c20d0f7d5237a9531595c2a102bd11)

Author: quinchou77

.github/workflows/lint.yml

@@ -7,7 +7,7 @@ on:
 jobs:
   build:
     name: lint new changes
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout code
         uses: actions/checkout@v4