linkerd/linkerd2 edge-21.12.4

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edge-21.12.4

This release adds support for custom HTTP methods in the viz stats
(i.e CLI and Dashboard). Additionally, it also includes various
smaller improvements.

• Added support for custom HTTP methods in the linkerd-viz stats
• Updated the health checker to pull trust root from the linkerd-identity-trust-roots
  configmap to support cases where they are generated externally (thanks @wim-de-groot)
• Removed unnecessary installNamespace bool flag from the
  linkerd-control-plane chart (thanks @mikutas)
• Updated the install command to error if container runtime check fails
• Updated various dependencies across the project (thanks @dependabot)