Package Dependencies: Bump MediatR from 12.3.0 to 12.4.0

[dependabot[bot]]

Bumps MediatR from 12.3.0 to 12.4.0.

Release notes

Sourced from MediatR's releases.

v12.4.0

What's Changed

• Add Support For Generic Handlers With Multiple Generic Type Parameters by @​zachpainter77 in jbogard/MediatR#1048

Full Changelog: https://github.com/jbogard/MediatR/compare/v12.3.0...v12.4.0

Commits

• cac76be Merge pull request #1048 from zachpainter77/master
• 811ce54 Added Opt Out functionality
• f645b68 added test to ensure that open handlers are resolved when the handler for the...
• d40d0f4 clean up test
• ef68751 Add test to ensure manual registration overrides the default open implementat...
• 8aa2d35 Merge remote-tracking branch 'origin/master'
• 52af2df Add support for request handlers having more than 1 type parameter.
• See full diff in compare view

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