Merge bitcoin/bitcoin#31793: ci: Use clang-20 for sanitizer tasks

fa5a02b ci: Use clang-20 for sanitizer tasks (MarcoFalke)

Pull request description:

  A new clang version generally comes with bugfixes, new (sanitizer) features, and deprecations.

  Upgrade the sanitizer tasks to use the new version.

  This was also suggested in bitcoin/bitcoin#31691 (comment)

ACKs for top commit:
  fanquake:
    ACK fa5a02b - tested 20 in some other infra, we just needed to fix the same deprecation warnings we'd seen, in cryptofuzz: fanquake/cryptofuzz@09ca550.

Tree-SHA512: 6114d790b5d7145eb5f019e02da6c2c833342707ad67fb9f9c09506001afbef0c9b9beee7e51321f17f12ea692509d6428e6072ad105dba51e4d54cd057621cd

ci/test/00_setup_env_native_asan.sh

@@ -19,7 +19,7 @@ else
 fi
 
 export CONTAINER_NAME=ci_native_asan
-export APT_LLVM_V="19"
+export APT_LLVM_V="20"
 export PACKAGES="systemtap-sdt-dev clang-${APT_LLVM_V} llvm-${APT_LLVM_V} libclang-rt-${APT_LLVM_V}-dev python3-zmq qtbase5-dev qttools5-dev qttools5-dev-tools libevent-dev libboost-dev libdb5.3++-dev libzmq3-dev libqrencode-dev libsqlite3-dev ${BPFCC_PACKAGE}"
 export NO_DEPENDS=1
 export GOAL="install"

ci/test/00_setup_env_native_fuzz.sh

@@ -8,7 +8,7 @@ export LC_ALL=C.UTF-8
 
 export CI_IMAGE_NAME_TAG="docker.io/ubuntu:24.04"
 export CONTAINER_NAME=ci_native_fuzz
-export APT_LLVM_V="19"
+export APT_LLVM_V="20"
 export PACKAGES="clang-${APT_LLVM_V} llvm-${APT_LLVM_V} libclang-rt-${APT_LLVM_V}-dev libevent-dev libboost-dev libsqlite3-dev"
 export NO_DEPENDS=1
 export RUN_UNIT_TESTS=false

ci/test/00_setup_env_native_tsan.sh

@@ -8,7 +8,7 @@ export LC_ALL=C.UTF-8
 
 export CONTAINER_NAME=ci_native_tsan
 export CI_IMAGE_NAME_TAG="docker.io/ubuntu:24.04"
-export APT_LLVM_V="19"
+export APT_LLVM_V="20"
 export PACKAGES="clang-${APT_LLVM_V} llvm-${APT_LLVM_V} libclang-rt-${APT_LLVM_V}-dev libc++abi-${APT_LLVM_V}-dev libc++-${APT_LLVM_V}-dev python3-zmq"
 export DEP_OPTS="CC=clang-${APT_LLVM_V} CXX='clang++-${APT_LLVM_V} -stdlib=libc++'"
 export GOAL="install"

ci/test/01_base_install.sh

@@ -49,7 +49,7 @@ if [ -n "$PIP_PACKAGES" ]; then
 fi
 
 if [[ ${USE_MEMORY_SANITIZER} == "true" ]]; then
-  ${CI_RETRY_EXE} git clone --depth=1 https://github.com/llvm/llvm-project -b "llvmorg-19.1.6" /msan/llvm-project
+  ${CI_RETRY_EXE} git clone --depth=1 https://github.com/llvm/llvm-project -b "llvmorg-20.1.0-rc1" /msan/llvm-project
 
   cmake -G Ninja -B /msan/clang_build/ \
     -DLLVM_ENABLE_PROJECTS="clang" \