fix: Use 'tomli' package instead of 'toml' package.

The 'toml' package breaks on valid 'pyproject.toml' files which prevents Tryceratops from being integrated properly.

The 'tomli' package provides TOML 1.0 and 'tomllib' compatibility. Had a similar patch accepted by the YAPF project in 2022.

Example of breakage with toml:

$ hatch --env develop run tryceratops
Traceback (most recent call last):
  File "/home/me/.local/share/hatch/env/virtual/accretive/5On6b-gH/develop/bin/tryceratops", line 8, in <module>
    sys.exit(main())
  File "/home/me/.local/share/hatch/env/virtual/accretive/5On6b-gH/develop/lib/python3.8/site-packages/tryceratops/__main__.py", line 66, in main
    entrypoint(prog_name="tryceratops")
  File "/home/me/.local/share/hatch/env/virtual/accretive/5On6b-gH/develop/lib/python3.8/site-packages/click/core.py", line 1157, in __call__
    return self.main(*args, **kwargs)
  File "/home/me/.local/share/hatch/env/virtual/accretive/5On6b-gH/develop/lib/python3.8/site-packages/click/core.py", line 1078, in main
    rv = self.invoke(ctx)
  File "/home/me/.local/share/hatch/env/virtual/accretive/5On6b-gH/develop/lib/python3.8/site-packages/click/core.py", line 1434, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/me/.local/share/hatch/env/virtual/accretive/5On6b-gH/develop/lib/python3.8/site-packages/click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)
  File "/home/me/.local/share/hatch/env/virtual/accretive/5On6b-gH/develop/lib/python3.8/site-packages/tryceratops/__main__.py", line 48, in entrypoint
    pyproj_config = load_config(dir)
  File "/home/me/.local/share/hatch/env/virtual/accretive/5On6b-gH/develop/lib/python3.8/site-packages/tryceratops/files/discovery.py", line 118, in load_config
    config = toml.load(toml_file)
  File "/home/me/.local/share/hatch/env/virtual/accretive/5On6b-gH/develop/lib/python3.8/site-packages/toml/decoder.py", line 134, in load
    return loads(ffile.read(), _dict, decoder)
  File "/home/me/.local/share/hatch/env/virtual/accretive/5On6b-gH/develop/lib/python3.8/site-packages/toml/decoder.py", line 362, in loads
    raise TomlDecodeError("Unterminated string found."
toml.decoder.TomlDecodeError: Unterminated string found. Reached end of file. (line 292 column 1 char 8542)

Successful run after switch to tomllib:

$ hatch --env develop run tryceratops
Done processing!
Nothing to check!
$ hatch --env develop run tryceratops sources
Done processing!
Processed 36 files
Everything clean!
$ hatch --env develop run pip freeze | grep tryceratops
tryceratops @ git+https://github.com/emcd/tryceratops@e1c57b6a1ea54b5b6e24b39bdfddb6b9d1ff51a4

guilatrova / tryceratops

fix: Use 'tomli' package instead of 'toml' package. #70