Deprecate ubuntu-20.04 images in actions

https://github.com/actions/runner-images/issues/11101

.github/workflows/build-and-test-perfcounters.yml

diff --git a/.github/workflows/build-and-test-perfcounters.yml b/.github/workflows/build-and-test-perfcounters.yml
index d12d020..ad92602 100644
--- a/.github/workflows/build-and-test-perfcounters.yml
+++ b/.github/workflows/build-and-test-perfcounters.yml
@@ -17,7 +17,7 @@
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-22.04, ubuntu-20.04]
+        os: [ubuntu-latest]
         build_type: ['Release', 'Debug']
     steps:
     - uses: actions/checkout@v4

.github/workflows/build-and-test.yml

diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index 8f061e1..858ea8c 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -20,7 +20,7 @@
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-22.04, ubuntu-20.04, ubuntu-22.04-arm, macos-latest]
+        os: [ubuntu-24.04, ubuntu-22.04, ubuntu-24.04-arm, macos-latest]
         build_type: ['Release', 'Debug']
         compiler: ['g++', 'clang++']
         lib: ['shared', 'static']