SNOW-1960924: Update GH Actions runner image (#2111)

Author: sfc-gh-pbulawa

.github/workflows/build-test.yml

@@ -27,7 +27,7 @@ concurrency:
 jobs:
     build:
         name: Build
-        runs-on: ubuntu-20.04
+        runs-on: ubuntu-latest
         steps:
             - uses: actions/checkout@v4
             - name: Build

.github/workflows/check-style.yml

@@ -7,7 +7,7 @@ on:
 jobs:
     check-style:
         name: Check Style
-        runs-on: ubuntu-20.04
+        runs-on: ubuntu-latest
         steps:
             - uses: actions/checkout@v4
             - name: Check Style