ci: use ubuntu-latest in lieu of ubuntu-20.04

Signed-off-by: Sebastien Binet <binet@cern.ch>

Author: sbinet

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         go-version: [1.23.x, 1.22.x]
-        platform: [ubuntu-20.04, macos-latest]
+        platform: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.platform }}
     env:
         GO111MODULE: on
@@ -66,7 +66,7 @@ jobs:
         go install -v ./...
 
     - name: Test Linux
-      if: matrix.platform == 'ubuntu-20.04'
+      if: matrix.platform == 'ubuntu-latest'
       run: |
         go test -v ./...
         ./.ci/check-imports.sh
@@ -83,5 +83,5 @@ jobs:
         go test -v ./...
 
     - name: Upload-Coverage
-      if: matrix.platform == 'ubuntu-20.04'
+      if: matrix.platform == 'ubuntu-latest'
       uses: codecov/codecov-action@v2