Update dependency diesel-guard to v0.3.0

[renovate]

This PR contains the following updates:

Package	Update	Change
diesel-guard	minor	0.2.0 -> 0.3.0

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Release Notes

ayarotsky/diesel-guard (diesel-guard)

v0.3.0

Compare Source

Added

• AddJsonColumn check - Detects adding JSON/JSONB columns without safe migration pattern
• AddPrimaryKey check - Detects ALTER TABLE ... ADD PRIMARY KEY operations
• DropPrimaryKey check - Detects ALTER TABLE ... DROP CONSTRAINT on primary keys
• WideIndex check - Detects indexes with excessive column count that may hurt performance
• TruncateTable check - Detects TRUNCATE TABLE operations in migrations
• DropIndex check - Detects DROP INDEX without CONCURRENTLY clause
• ShortIntegerPrimaryKey check - Detects INTEGER (32-bit) primary keys that risk overflow
• AddUniqueConstraint check - Detects ALTER TABLE ... ADD CONSTRAINT ... UNIQUE operations
• GitHub Actions CI workflow for automated testing
• Parse error reporting now includes source code spans and line numbers for better debugging

Changed

• CI toolchain locked to Rust 1.90.0 for consistent builds
• Documentation improvements including table of contents in README
• Fixed CHECK constraint naming examples to follow best practices

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