misc: Update Update GitHub Actions to use 24.04 over 22.04

This change ensures all our tests run on our most recent supported LTS
release of Ubuntu.

In the case of compiler tests we still test 22.04 all-dep but test 24.04
all-dep and min-dep (i.e., we drop 22.04 min-dep as it's somewhat
redundant).

Change-Id: I63666d1017594b496523a48e5112a8994f57885f

.github/workflows/ci-tests.yaml

@@ -50,7 +50,7 @@ jobs:
     unittests-all-opt:
         runs-on: [self-hosted, linux, x64]
         if: github.event.pull_request.draft == false
-        container: ghcr.io/gem5/ubuntu-22.04_all-dependencies:latest
+        container: ghcr.io/gem5/ubuntu-24.04_all-dependencies:latest
         needs: [pre-commit, check-for-change-id] # only runs if pre-commit and change-id passes
         timeout-minutes: 60
         steps:
@@ -65,7 +65,7 @@ jobs:
         if: github.event.pull_request.draft == false
     # In order to make sure the environment is exactly the same, we run in
     # the same container we use to build gem5 and run the testlib tests. This
-        container: ghcr.io/gem5/ubuntu-22.04_all-dependencies:latest
+        container: ghcr.io/gem5/ubuntu-24.04_all-dependencies:latest
         needs: [pre-commit, check-for-change-id]
         steps:
             - uses: actions/checkout@v4
@@ -108,7 +108,7 @@ jobs:
     testlib-quick-gem5-builds:
         runs-on: [self-hosted, linux, x64]
         if: github.event.pull_request.draft == false
-        container: ghcr.io/gem5/ubuntu-22.04_all-dependencies:latest
+        container: ghcr.io/gem5/ubuntu-24.04_all-dependencies:latest
         needs: [pre-commit, check-for-change-id, testlib-quick-matrix]
         strategy:
             matrix:
@@ -138,7 +138,7 @@ jobs:
     testlib-quick-execution:
         runs-on: [self-hosted, linux, x64]
         if: github.event.pull_request.draft == false
-        container: ghcr.io/gem5/ubuntu-22.04_all-dependencies:latest
+        container: ghcr.io/gem5/ubuntu-24.04_all-dependencies:latest
         needs: [pre-commit, check-for-change-id, testlib-quick-matrix, testlib-quick-gem5-builds]
         timeout-minutes: 360 # 6 hours
         strategy: