v2.1.1

This is a primarily a performance improvement patch, reducing the memory footprint by about 45MB, and the initial load time, by:

• using a more compact in-memory structure for the English lexicon, and
• replacing the heavy-weight networkx library by a tiny custom class implementing only the algorithms used.

✨ New Features

• 966a057 - allow panphon 0.21 where possible (commit by @joanise)
• aa9de1c - g2p show-mappings to display language names too (commit by @joanise)
• c70f30f - network_lite with minimal DiGraph class (commit by @joanise)
• 123e27b - add full type signatures to DiGraph (commit by @dhdaines)
• 6eb29ac - revamp schema versioning and update-schema (commit by @joanise)

🐛 Bug Fixes

• 8929608 - add [tool.setuptools_scm] in pyproject.toml to please the build system (commit by @joanise)
• 208a8e0 - deps: pydantic 2.9 changes our schemas, so block it (commit by @joanise)
• 16668b2 - enable type-checking and fix things (commit by @dhdaines)
• 6ab8545 - make sure self.rules is always the type we say it is (commit by @dhdaines)
• 3eee1a6 - seeing match_pattern or intermediate_form is an error (commit by @dhdaines)
• bbcd1e8 - avoid unnecessarily requiring a schema update (commit by @joanise)

⚡ Performance Improvements

• e605ae5 - compact lexicon entries to take less RAM (commit by @joanise)
• 96abff3 - replace networkx by network_lite throughout reduces memory footprint and load time (commit by @joanise)

♻️ Refactors

• d1b3437 - simplify shortest_path code (commit by @dhdaines)
• e2def43 - only declare the SCM pretend version in one place (commit by @joanise)

✅ Tests

• d03aabb - carefully cover compact lexicon corner cases (commit by @joanise)

🔧 Chores

• 0523ba9 - g2p update (commit by @dhdaines)
• 72e761d - g2p update, to get compacted lexicon (commit by @joanise)