deps(go): bump module github.com/zitadel/zitadel-go/v3 to v3.21.0

[updateclibot]

deps(go): bump module github.com/zitadel/zitadel-go/v3

clean: go mod tidy

ran shell command "go mod tidy"

deps(go): bump module github.com/zitadel/zitadel-go/v3 to v3.21.0

go.mod updated Module path "github.com/zitadel/zitadel-go/v3" version from "v3.18.1" to "v3.21.0"

v3.18.1

## [3.18.1](https://github.com/zitadel/zitadel-go/compare/v3.18.0...v3.18.1) (2025-11-14)


### Bug Fixes

* update zitadel api to v4.6.5 ([f25f8d1](https://github.com/zitadel/zitadel-go/commit/f25f8d12180669ec58334cd4e77cc2db0aa3fddd))
* Update ZITADEL API to v4.6.6 ([#538](https://github.com/zitadel/zitadel-go/issues/538)) ([afb407c](https://github.com/zitadel/zitadel-go/commit/afb407c4cb3289aa543e4676fc827a3bc13d391a))

v3.19.0

# [3.19.0](https://github.com/zitadel/zitadel-go/compare/v3.18.1...v3.19.0) (2025-12-03)


### Features

* **sdk:** bump ZITADEL client to v4.7.0 ([cf48922](https://github.com/zitadel/zitadel-go/commit/cf48922d7157c9df4bb2f94980f54069f84f03b2))
* **sdk:** bump ZITADEL client to v4.7.0 ([#548](https://github.com/zitadel/zitadel-go/issues/548)) ([e414818](https://github.com/zitadel/zitadel-go/commit/e414818b0f7ae1667458c979e91f022839a2444d))

v3.19.1

## [3.19.1](https://github.com/zitadel/zitadel-go/compare/v3.19.0...v3.19.1) (2026-01-05)


### Bug Fixes

* introduce DefaultContext alias for better type inference ([c588c18](https://github.com/zitadel/zitadel-go/commit/c588c180932db1361f9210f5a13d7f6120ca4672))
* introduce DefaultContext alias for better type inference ([#549](https://github.com/zitadel/zitadel-go/issues/549)) ([7f579dc](https://github.com/zitadel/zitadel-go/commit/7f579dc0c7a00774ac4e56e3db484de3afec9309)), closes [#537](https://github.com/zitadel/zitadel-go/issues/537)

v3.20.0

# [3.20.0](https://github.com/zitadel/zitadel-go/compare/v3.19.1...v3.20.0) (2026-01-05)


### Features

* propagate insecure TLS config and add custom headers ([f43e6c0](https://github.com/zitadel/zitadel-go/commit/f43e6c068ac8629747fc4abb078b0911e6f2fad1))
* propagate insecure TLS config and add custom headers ([#557](https://github.com/zitadel/zitadel-go/issues/557)) ([b7201b7](https://github.com/zitadel/zitadel-go/commit/b7201b7e66378fb0c44ed4ea6aefb22cc31ee1e2))

v3.20.1

## [3.20.1](https://github.com/zitadel/zitadel-go/compare/v3.20.0...v3.20.1) (2026-01-05)


### Bug Fixes

* update zitadel api to v4.8.0 ([6e79c9e](https://github.com/zitadel/zitadel-go/commit/6e79c9ea7e42f685f27f59c808352e0d6918e0a4))
* Update ZITADEL API to v4.8.0 ([#556](https://github.com/zitadel/zitadel-go/issues/556)) ([770e2a8](https://github.com/zitadel/zitadel-go/commit/770e2a8389d4cb834f689ce77b270581d2313826))

v3.20.2

## [3.20.2](https://github.com/zitadel/zitadel-go/compare/v3.20.1...v3.20.2) (2026-01-06)


### Bug Fixes

* Preserve gRPC status codes in unary interceptor ([cf8bac3](https://github.com/zitadel/zitadel-go/commit/cf8bac34ac69294a7438184e9f21fdf55c2edfb8))
* Preserve gRPC status codes in unary interceptor ([#547](https://github.com/zitadel/zitadel-go/issues/547)) ([32b39db](https://github.com/zitadel/zitadel-go/commit/32b39db980c10527f5742effbc50e4e49eb161a0))

v3.20.3

## [3.20.3](https://github.com/zitadel/zitadel-go/compare/v3.20.2...v3.20.3) (2026-01-06)


### Bug Fixes

* update zitadel api to v4.8.1 ([949d081](https://github.com/zitadel/zitadel-go/commit/949d0817c2e0e29e4e7bf59143e1ef93dd6dea92))
* Update ZITADEL API to v4.8.1 ([#558](https://github.com/zitadel/zitadel-go/issues/558)) ([18d9ff1](https://github.com/zitadel/zitadel-go/commit/18d9ff1f2622322b9e783f510623aa387116c83a))

v3.20.4

## [3.20.4](https://github.com/zitadel/zitadel-go/compare/v3.20.3...v3.20.4) (2026-01-07)


### Bug Fixes

* update zitadel api to v4.9.0 ([ca2f5cb](https://github.com/zitadel/zitadel-go/commit/ca2f5cbec8aebcdcf2839f36ec632cd8a852784a))
* Update ZITADEL API to v4.9.0 ([#562](https://github.com/zitadel/zitadel-go/issues/562)) ([132bf2a](https://github.com/zitadel/zitadel-go/commit/132bf2a0a27ebddc4735e295641516c878c1abc3))

v3.21.0

# [3.21.0](https://github.com/zitadel/zitadel-go/compare/v3.20.4...v3.21.0) (2026-01-08)


### Features

* add transport header and tls options to direct clients ([0152932](https://github.com/zitadel/zitadel-go/commit/01529326b889689b76ee71f590ac5a7ffb752e6f))
* add transport header and tls options to direct clients ([#561](https://github.com/zitadel/zitadel-go/issues/561)) ([16901cb](https://github.com/zitadel/zitadel-go/commit/16901cb0dfae7928ab335a0ab11f159033e94d74))

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