chore(deps): update terraform consul to v2.21.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
consul (source)	required_provider	minor	2.20.0 -> 2.21.0

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Release Notes

hashicorp/terraform-provider-consul (consul)

v2.21.0

Compare Source

BUG FIXES:

• The consul_config_entry_service_intentions resource no longer panics when optional JWT is unset (#​386).

NEW FEATURES:

• The consul_peering_token resource now exposes the ServerExternalAddresses field from the API (#​387).

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