CLDSRV-635: Fix ubuntu 20 in CI

> This is a scheduled Ubuntu 20.04 brownout. Ubuntu 20.04 LTS runner will be removed on 2025-04-15. For more details, see actions/runner-images#11101

Author: BourgoisMickael

.github/workflows/release.yaml

@@ -11,7 +11,7 @@ on:
 
 jobs:
   build-federation-image:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -35,7 +35,7 @@ jobs:
           cache-to: type=gha,mode=max,scope=federation
 
   build-image:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v4

.github/workflows/tests.yaml

@@ -125,7 +125,7 @@ jobs:
       if: always()
 
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -164,7 +164,7 @@ jobs:
           cache-to: type=gha,mode=max,scope=pykmip
 
   build-federation-image:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v4