chore(master): release 2.3.0

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🤖 I have created a release

2.3.0 (2025-11-13)

Features

• Add test infrastructure with multi-version Ruby support (9c16d4c)
• Add test infrastructure with multi-version Ruby support (232e569)

Bug Fixes

• Add flush before rewind in Tempfile tests (4c31ad3)

Miscellaneous Chores

• Switch test framework from Minitest to RSpec (d766068)
• Update gemspec metadata (7dbd6f8)

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