chore(develop): release 8.6.0

[release-please]

🤖 I have created a release beep boop

8.6.0 (2026-04-10)

Features

• Add caching mechanism for Backend functions (#1711) (b9e6f27)
• Add Db2 binary types to supported types (#1679) (04ad3a8)
• Add support for differing source/target schema names to find-tables (#1692) (a9b5377)
• Reduce Redshift queries (#1687) (b0155ec)

Bug Fixes

• Add raw datatype support for Db2 custom queries (#1707) (cc0b62f)
• custom query row validation on Db2 loses precision and scale (#1727) (ff3573f)
• Force Db2 FOR BIT DATA columns to Ibis Binary (#1690) (752170b)
• mock list_validations in config_runner tests to remove GCS dependency (#1708) (2882d50), closes #1482
• Prevent scientific notation in row validation for Db2 REAL/DOUBLE columns (#1723) (e67dccf)
• Protect PostgreSQL padded chars length expression from NULLs (#1726) (806e30b)
• Replace typehints that are incompatible with Python 3.9 (#1704) (97e959c)

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