Upgrade terraform-provider-tailscale to v0.21.0

[pulumi-bot]

This PR was generated via $ upgrade-provider pulumi/pulumi-tailscale --kind=provider --target-bridge-version=latest --target-version=0.21.0 --allow-missing-docs=true.

---

• Upgrading terraform-provider-tailscale from 0.20.0 to 0.21.0.
  Fixes Upgrade terraform-provider-tailscale to v0.21.0 #695

[github-actions]

Does the PR have any schema changes?

Found 2 breaking changes:

Resources

• 🟡 "tailscale:index/oauthClient:OauthClient": inputs: "userId" missing

Types

• 🟢 "tailscale:index/getDevicesDevice:getDevicesDevice": required: "nodeId" property has changed to Required
  No new resources/functions.

Maintainer note: consult the runbook for dealing with any breaking changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (bec1f14) to head (de05746).

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #696   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files           3       3           
  Lines          97      97           
======================================
  Misses         97      97           

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