ci: modify leak sanitizer Dockerfile

tools/ci/images/leak_sanitizer/Dockerfile

@@ -17,7 +17,6 @@ RUN apk add --no-cache \
     ninja \
     libc-dev \
     zlib-dev \
-    libexecinfo-dev \
     libunwind-dev
 
 RUN pip install --no-cache-dir --break-system-packages conan gitpython \
@@ -40,6 +39,7 @@ RUN cd llvm-project/  \
     && cmake \
     -G Ninja \
     -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_LINKER_TYPE="MOLD" \
     -DCMAKE_INSTALL_PREFIX=/libcxx_lsan \
     -DCMAKE_C_COMPILER=clang \
     -DCMAKE_CXX_COMPILER=clang++ \