Update to Substrait v0.86.0

[nielspardon]

Release Notes

0.86.0 (2026-03-22)

⚠ BREAKING CHANGES

• extensions: random extraneous argument for repeat varchar (#1015)
• extensions: corrects the return type of the add:date_iyear

Features

• add optional description field to function implementations (#1013) (0f4c774)
• extensions: support deprecation info in extensions (#1014) (25d87ef)

Bug Fixes

• enforce nullable types for null literals in test cases (#989) (ba9b0ff)
• extensions: correct return type for add:date_iyear operation (#1007) (62147cf)
• extensions: random extraneous argument for repeat varchar (#1015) (271d7bb)

See https://github.com/substrait-io/substrait/releases/tag/v0.86.0