chore: prepare v0.3.14 release

[hachej]

Patch bump to v0.3.14.

Included PRs (since v0.3.13)

• fix: handle plain ibis backends in join backend rebinding #222 — fix: handle plain ibis backends in join backend rebinding (fixes Joins on snowflake cause ValueError: Don't know how to handle type <class 'ibis.expr.types.relations.Table'> #221, Snowflake/Databricks/BigQuery)
• fix: preserve preagg + canonical backend through with_measures on joins #261 — fix: preserve preagg + canonical backend through with_measures on joins
• Unify calc measures on ibis-native classifier (ADR 0001 phases 1+2) #262 — Unify calc measures on ibis-native classifier (ADR 0001 phases 1+2)
• fix(serialization): use HashingTag so BSL metadata contributes to content hash #264 — fix(serialization): use HashingTag so BSL metadata contributes to content hash

After merge

1. Tag v0.3.14 on main
2. Push tag (triggers PyPI release workflow)
3. Create GitHub release using .tmp_release_body_v0.3.14.md from the branch

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