Bumps sqlparse from 0.4.1 to 0.4.2.

Sourced from sqlparse's changelog.

Release 0.4.2 (Sep 10, 2021)

Notable Changes

• IMPORTANT: This release fixes a security vulnerability in the strip comments filter. In this filter a regular expression that was vulnerable to ReDOS (Regular Expression Denial of Service) was used. See the security advisory for details: GHSA-p5w8-wqhj-9hhf The vulnerability was discovered by @​erik-krogh and @​yoff from GitHub Security Lab (GHSL). Thanks for reporting!

Enhancements

• Add ELSIF as keyword (issue584).
• Add CONFLICT and ON_ERROR_STOP keywords (pr595, by j-martin).

Bug Fixes

• Fix parsing of backticks (issue588).
• Fix parsing of scientific number (issue399).

• b1f76f6 Update changelog.
• 3eec44e Update Changelog and bump version.
• 8238a9e Optimize regular expression for identifying line breaks in comments.
• e660467 Fix parsing of scientific numbers (fixes #399).
• 23d2993 Update authors and changelog.
• acc2810 keyword, add ON_ERROR_STOP
• 282bcf1 keyword, add CONFLICT to postgres keywords
• 63885dd Add ELSIF as keyword (fixes #584).
• e575ae2 Fix parsing of backticks (fixes #588).
• fe39072 Switch back to development mode.
• Additional commits viewable in compare view

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