Bump StackExchange.Redis from 2.6.86 to 2.6.90
Bumps [StackExchange.Redis](https://github.com/StackExchange/StackExchange.Redis) from 2.6.86 to 2.6.90.
- [Release notes](https://github.com/StackExchange/StackExchange.Redis/releases)
- [Changelog](https://github.com/StackExchange/StackExchange.Redis/blob/main/docs/ReleaseNotes.md)
- [Commits](https://github.com/StackExchange/StackExchange.Redis/compare/2.6.86...2.6.90)
---
updated-dependencies:
- dependency-name: StackExchange.Redis
dependency-type: direct:production
update-type: version-update:semver-patch
...
Signed-off-by: dependabot[bot] <support@github.com>
