Bump envtest binaries to v1.22

[timebertt]

How to categorize this PR?

/area dev-productivity
/kind enhancement

What this PR does / why we need it:

Bump envtest binaries to v1.22 to make use of disabled etcd fsync in envtests.

Quick comparison on my machine:
Before:

$ make test-integration
> Installing envtest tools@1.20 with setup-envtest if necessary
using envtest tools installed at '/Users/timebertt/Library/Application Support/io.kubebuilder.envtest/k8s/1.20.2-darwin-amd64'
> Integration Tests
ok  	github.com/gardener/gardener/extensions/test/integration/envtest/backupbucket	47.720s
ok  	github.com/gardener/gardener/test/integration/envtest/envtest	30.591s
ok  	github.com/gardener/gardener/test/integration/envtest/seedadmissioncontroller	33.503s
ok  	github.com/gardener/gardener/test/integration/envtest/shootretry	32.240s

After:

$ make test-integration
> Installing envtest tools@1.22 with setup-envtest if necessary
using envtest tools installed at '/Users/d067603/Library/Application Support/io.kubebuilder.envtest/k8s/1.22.0-darwin-amd64'
> Integration Tests
ok  	github.com/gardener/gardener/extensions/test/integration/envtest/backupbucket	31.206s
ok  	github.com/gardener/gardener/test/integration/envtest/envtest	14.243s
ok  	github.com/gardener/gardener/test/integration/envtest/seedadmissioncontroller	13.674s
ok  	github.com/gardener/gardener/test/integration/envtest/shootretry	14.426s

Which issue(s) this PR fixes:
Part of #4772

Special notes for your reviewer:

This is a breaking change for extensions, as they need to update the CRDs that are added during integration tests.
E.g. this test will start failing: https://github.com/gardener/gardener-extension-provider-aws/blob/51d2a020b218c16d4dbc1f0a197c9a83bae9f48e/test/integration/dnsrecord/dnsrecord_test.go#L110-L122
Ref gardener/gardener-extension-provider-aws#430

Release note:

Envtest binaries have been upgraded to version v1.22. By this, we disable etcd fsync in envtests which speeds up test execution by not writing etcd data to disk.

Envtest binaries have been upgraded to version v1.22. Please ensure to update your CRD and Webhook manifests to API versions supported in v1.22. You can consult [this guide](https://kubernetes.io/docs/reference/using-api/deprecation-guide/#v1-22) for help on the migration.

[rfranzke]

/lgtm