Update sqlparser requirement from 0.55 to 0.56

[dependabot]

Updates the requirements on sqlparser to permit the latest version.

Changelog

Sourced from sqlparser's changelog.

Changelog

All notable changes to this project will be documented in one of the linked files.

This project adheres to Semantic Versioning.

Given that the parser produces a typed AST, any changes to the AST will technically be breaking and thus will result in a 0.(N+1) version.

• Unreleased: Check https://github.com/sqlparser-rs/sqlparser-rs/commits/main for undocumented changes.
• 0.56.0: https://github.com/apache/datafusion-sqlparser-rs/blob/main/changelog/0.56.0.md
• 0.55.0: https://github.com/apache/datafusion-sqlparser-rs/blob/main/changelog/0.55.0.md
• 0.54.0: https://github.com/apache/datafusion-sqlparser-rs/blob/main/changelog/0.54.0.md
• 0.53.0: https://github.com/apache/datafusion-sqlparser-rs/blob/main/changelog/0.53.0.md
• 0.52.0: https://github.com/apache/datafusion-sqlparser-rs/blob/main/changelog/0.52.0.md
• 0.51.0 and earlier: https://github.com/apache/datafusion-sqlparser-rs/blob/main/changelog/0.51.0-pre.md

Commits

• a5b9821 Update 56.0.0 Changelog with latest commits (#1832)
• c0921dc Prepare for 0.56.0 release: Version and CHANGELOG (#1822)
• 2b5bdce Snowflake: Add support for CONNECT_BY_ROOT (#1780)
• 4e392f5 Handle missing login in changelog generate script (#1823)
• 7703fd0 Add DECLARE ... CURSOR FOR support for SQL Server (#1821)
• 87d1907 Add OR ALTER support for CREATE VIEW (#1818)
• 2eb1e7b Add CREATE FUNCTION support for SQL Server (#1808)
• 945f8e0 Add support for XMLTABLE (#1817)
• 3ec80e1 enable supports_filter_during_aggregation for Generic dialect (#1815)
• 4a48729 Add support for PRINT statement for SQL Server (#1811)
• Additional commits viewable in compare view

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[dependabot]

Looks like sqlparser is up-to-date now, so this is no longer needed.