Upgrade dskit and remove dependency on weaveworks/common

[charleskorn]

What this PR does / why we need it:

This PR upgrades github.com/grafana/dskit removes Loki's dependency on github.com/weaveworks/common.

The changes in dskit, apart from the migration (grafana/dskit#356), are:

• server: correctly route PATCH requests when using RouteHTTPToGRPC dskit#347
• Add ability to pass TLS certs and keys inline dskit#349, which required small changes in pkg/canary/reader/reader.go and pkg/canary/writer/push.go
• Add a rate limit on logger dskit#352
• feat: add redis pool_timeout dskit#354

Which issue(s) this PR fixes:

(none)

Special notes for your reviewer:

Checklist

• Reviewed the CONTRIBUTING.md guide (required)
• [n/a] Documentation added
• [n/a] Tests updated
• [n/a] CHANGELOG.md updated
  • [n/a] If the change is worth mentioning in the release notes, add add-to-release-notes label
• [n/a] Changes that require user attention or interaction to upgrade are documented in docs/sources/setup/upgrade/_index.md
• [n/a] For Helm chart changes bump the Helm chart version in production/helm/loki/Chart.yaml and update production/helm/loki/CHANGELOG.md and production/helm/loki/README.md. Example PR

[MichelHollands]

LGTM. Thanks for doing this