feat: drop Ubuntu Bionic support

Fixes #2035

playout/tests/liquidsoap/client/connection_test.py

@@ -62,7 +62,7 @@ def liq_conn_fixture(request, tmp_path_factory):
     logger.debug(liq_script)
     entrypoint.write_text(liq_script)
 
-    # The --verbose flag seem to hang when testing on bionic in CI
+    # The --verbose flag seem to hang when testing in CI
     with Popen(
         ("liquidsoap", "--debug", str(entrypoint)),
         stdout=PIPE,

playout/tests/liquidsoap/version_test.py

@@ -28,7 +28,6 @@ def test_parse_liquidsoap_version(version, expected):
 @pytest.mark.skipif(getenv("CI") != "true", reason="requires liquidsoap")
 def test_get_liquidsoap_version():
     LIQUIDSOAP_VERSION_MAP = {
-        "bionic": (1, 1, 1),
         "buster": (1, 3, 3),
         "focal": (1, 4, 1),
         "bullseye": (1, 4, 3),