Bump dogpile-cache from 1.1.5 to 1.1.8

Bumps [dogpile-cache](https://github.com/sqlalchemy/dogpile.cache) from 1.1.5 to 1.1.8.
- [Release notes](https://github.com/sqlalchemy/dogpile.cache/releases)
- [Commits](https://github.com/sqlalchemy/dogpile.cache/commits)

---
updated-dependencies:
- dependency-name: dogpile-cache
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>