ci/oss-fuzz: switch to Ubuntu 24.04

With google/oss-fuzz#14112 and
google/oss-fuzz#14128, we can now use Ubuntu
24.04. Let's bump the image version.

Author: yuwata

.github/workflows/cifuzz.yml

@@ -22,8 +22,7 @@ on:
       - main
 jobs:
   Fuzzing:
-    # FIXME: Figure out why 32-bit applications fail to run in docker on Ubuntu 24.04.
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     if: github.repository == 'systemd/systemd'
     concurrency:
       group: ${{ github.workflow }}-${{ matrix.sanitizer }}-${{ matrix.architecture }}-${{ github.ref }}