Use clang 18 and ubuntu-24.04 runner

.github/workflows/code_sanitizers.yml

@@ -21,7 +21,7 @@ jobs:
           # Bug when running with TSAN: "ThreadSanitizer: CHECK failed: sanitizer_deadlock_detector"
           - BACKEND: rocksdb
             SANITIZER: { name: TSAN }
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     env:
       COMPILER: ${{ matrix.COMPILER }}
       BACKEND: ${{ matrix.BACKEND }}

.github/workflows/unit_tests.yml

@@ -56,7 +56,7 @@ jobs:
         COMPILER: [gcc, clang]
         RELEASE:
           - ${{ startsWith(github.ref, 'refs/tags/') }}
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     env:
       COMPILER: ${{ matrix.COMPILER }}
       BACKEND: ${{ matrix.BACKEND }}

ci/prepare/linux/prepare-clang.sh

@@ -4,10 +4,7 @@ set -euox pipefail
 # Clang installer dependencies
 DEBIAN_FRONTEND=noninteractive apt-get install -yqq lsb-release software-properties-common gnupg
 
-CLANG_VERSION=16
-
-# TODO: Verify integrity (at this time, the clang build is not used for any production artifacts)
-curl -O https://apt.llvm.org/llvm.sh && chmod +x llvm.sh && ./llvm.sh $CLANG_VERSION
+CLANG_VERSION=18
 
 update-alternatives --install /usr/bin/cc cc /usr/bin/clang-$CLANG_VERSION 100
 update-alternatives --install /usr/bin/c++ c++ /usr/bin/clang++-$CLANG_VERSION 100