Bump CsvHelper from 15.0.8 to 27.1.1

[dependabot-preview[bot]]

Bumps CsvHelper from 15.0.8 to 27.1.1.

Commits

• 267c0cf Updated change log. Docs build.
• 9b04a08 Fixed issue with delimiter detection in parser async read.
• d61651d Added missing migration doc files.
• f68a5a1 Added start of migration docs. Docs build.
• c9bee55 Updated change log. Docs build.
• 15a5e20 Added IgnoreBaseAttribute to not look at the base class when auto mapping.
• e0545f6 Updated change log. Docs build.
• dca4f2f Changed delimiter detection to look line by line instead of the full buffer.
• a588b7e Updated change log.
• 18c4264 Turned of parallel execution of tests in xunit.
• Additional commits viewable in compare view

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