support interpreter names like '3.13t

[ngoldbaum]

Without this, I get:

± maturin build --release --out dist --interpreter 3.13t
📦 Including license file "/Users/goldbaum/Documents/rpds-py/LICENSE"
🔗 Found pyo3 bindings
⚠️  Warning: Failed to determine python platform
[src/build_options.rs:1254:22] interp.display().to_string() = "3.13t"
💥 maturin failed
  Caused by: Invalid python interpreter minor version '13t', expect a digit
  Caused by: invalid digit found in string

[ngoldbaum]

Are there tests for the maturin CLI somewhere?

[messense]

Already done in #2324