Fix project.license

- Per PEP 639 the `project.license.text` format is legacy and
  deprecated.
- Fix the value to be the correct SPDX (short) identifier for Apache
  2.

Fixes #292

Author: masklinn

pyproject.toml

@@ -9,8 +9,7 @@ version = "1.0.1"
 readme = "README.rst"
 requires-python = ">=3.10"
 dependencies = ["ua-parser-builtins"]
-
-license = {text = "Apache 2.0"}
+license = "Apache-2.0"
 
 authors = [
    { name = "Stephen Lamm", email = "slamm@google.com"},