ci: explicitly install python3-lldb-$COMPILER_VERSION

To avoid apt complaining:

 + apt-get -y install clang-15 lldb-15 lld-15 clangd-15
Reading package lists...
Building dependency tree...
Reading state information...
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 python3-lldb-14 : Conflicts: python3-lldb-x.y
 python3-lldb-15 : Conflicts: python3-lldb-x.y
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

Author: mrc0mmand

.github/workflows/build_test.sh

@@ -87,7 +87,7 @@ if [[ "$COMPILER" == clang ]]; then
                "$RELEASE" "$RELEASE" "$COMPILER_VERSION" >/etc/apt/sources.list.d/llvm-toolchain.list
     fi
 
-    PACKAGES+=("clang-$COMPILER_VERSION" "lldb-$COMPILER_VERSION" "lld-$COMPILER_VERSION" "clangd-$COMPILER_VERSION")
+    PACKAGES+=("clang-$COMPILER_VERSION" "lldb-$COMPILER_VERSION" "python3-lldb-$COMPILER_VERSION" "lld-$COMPILER_VERSION" "clangd-$COMPILER_VERSION")
 elif [[ "$COMPILER" == gcc ]]; then
     CC="gcc-$COMPILER_VERSION"
     CXX="g++-$COMPILER_VERSION"