Update ubuntu image (#2467)

.github/workflows/continuous.yml

@@ -25,7 +25,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, macos-latest]
+        os: [ubuntu-24.04, macos-latest]
         config: [Release]
         build-params: [ {static:  ON, tutorials:  ON, tests:  ON }, {static: OFF, tutorials: OFF, tests:  ON }, {static: OFF, tutorials:  ON, tests: OFF }]
     env: