ci: Use clang-12 for asan task

Changes from Ubuntu Focal to Hirsute to get clang-12.
Generally, it can be expected that more recent compilers have
better support for sanitizers.

.cirrus.yml

@@ -143,10 +143,10 @@ task:
     FILE_ENV: "./ci/test/00_setup_env_native_msan.sh"
 
 task:
-  name: '[no depends, sanitizers: address/leak (ASan + LSan) + undefined (UBSan) + integer] [focal]'
+  name: '[no depends, sanitizers: address/leak (ASan + LSan) + undefined (UBSan) + integer] [hirsute]'
   << : *GLOBAL_TASK_TEMPLATE
   container:
-    image: ubuntu:focal
+    image: ubuntu:hirsute
   env:
     << : *CIRRUS_EPHEMERAL_WORKER_TEMPLATE_ENV
     FILE_ENV: "./ci/test/00_setup_env_native_asan.sh"

ci/test/00_setup_env_native_asan.sh

@@ -8,7 +8,7 @@ export LC_ALL=C.UTF-8
 
 export CONTAINER_NAME=ci_native_asan
 export PACKAGES="clang llvm python3-zmq qtbase5-dev qttools5-dev-tools libevent-dev bsdmainutils libboost-dev libboost-system-dev libboost-filesystem-dev libboost-test-dev libdb5.3++-dev libminiupnpc-dev libnatpmp-dev libzmq3-dev libqrencode-dev libsqlite3-dev"
-export DOCKER_NAME_TAG=ubuntu:20.04
+export DOCKER_NAME_TAG=ubuntu:hirsute
 export NO_DEPENDS=1
 export GOAL="install"
 export BITCOIN_CONFIG="--enable-zmq --with-incompatible-bdb --with-gui=qt5 CPPFLAGS='-DARENA_DEBUG -DDEBUG_LOCKORDER' --with-sanitizers=address,integer,undefined CC=clang CXX=clang++ --enable-external-signer"