Add Debian packages, support Ubuntu 22 via tomli

src/jinjaturtle/handlers/toml.py

@@ -1,12 +1,16 @@
 from __future__ import annotations
 
-import tomllib
 from pathlib import Path
 from typing import Any
 
 from . import DictLikeHandler
 from ..loop_analyzer import LoopCandidate
 
+try:
+    import tomllib
+except Exception:
+    import tomli as tomllib
+
 
 class TomlHandler(DictLikeHandler):
     fmt = "toml"