Support mtl >= 2.3

[parsonsmatt]

Tested locally by forcing mtl == 2.3.1 in the constraints. Appears to work OK.

persistent-redis has an upper bound, but hedis itself can't work. Pending informatikr/hedis#190 PR.

Before submitting your PR, check that you've:

• Documented new APIs with Haddock markup
• Added @since declarations to the Haddock
• Ran stylish-haskell on any changed files.
• Adhered to the code style (see the .editorconfig file for details)

After submitting your PR:

• Update the Changelog.md file with a link to your PR
• Bumped the version number if there isn't an (unreleased) on the Changelog
• Check that CI passes (or if it fails, for reasons unrelated to your change, like CI timeouts)

[parsonsmatt]

Revision published