Lowered minimum Python version to 3.12 and added CI matrix for testing 3.12/3.13/3.14.

pyproject.toml

@@ -2,7 +2,7 @@
 name = "owlbot"
 dynamic = ["version"]
 description = "An Owncast chat bot with a modular event-driven architecture"
-requires-python = ">=3.14"
+requires-python = ">=3.12"
 license = "Apache-2.0"
 authors = [
     { name = "Logan Fick" },
@@ -54,7 +54,7 @@ packages = ["owlbot"]
 version-file = "owlbot/_version.py"
 
 [tool.mypy]
-python_version = "3.14"
+python_version = "3.12"
 strict = true
 warn_unreachable = true
 explicit_package_bases = true
@@ -63,7 +63,7 @@ explicit_package_bases = true
 asyncio_mode = "auto"
 
 [tool.ruff]
-target-version = "py314"
+target-version = "py312"
 extend-exclude = ["owlbot/_version.py"]  # auto-generated by hatch-vcs
 
 [tool.ruff.lint]