Release v0.15.3

[ChenYi015]

Purpose of this PR

Release v0.15.3.

Deprecations

• Deprecate apiextensions.k8s.io/v1beta1 CRD (#1330 by @ChenYi015)

Features

• feature(tf-operator): make workers, qps and burst configurable (#1379 by @ChenYi015)

Dependencies

• chore(deps): bump actions/stale from 9 to 10 (#1374 by @dependabot[bot])
• chore(deps): bump actions/setup-go from 5 to 6 (#1375 by @dependabot[bot])
• chore(deps): bump actions/setup-python from 5 to 6 (#1376 by @dependabot[bot])
• chore(deps): bump actions/download-artifact from 5 to 6 (#1383 by @dependabot[bot])
• chore(deps): bump actions/upload-artifact from 4 to 5 (#1382 by @dependabot[bot])
• chore(deps): bump github.com/containerd/containerd from 1.7.27 to 1.7.29 (#1384 by @dependabot[bot])
• chore(deps): bump golang.org/x/crypto from 0.41.0 to 0.45.0 (#1388 by @dependabot[bot])
• chore(deps): bump github.com/spf13/pflag from 1.0.7 to 1.0.10 (#1372 by @dependabot[bot])
• chore(deps): bump google.golang.org/protobuf from 1.36.7 to 1.36.10 (#1381 by @dependabot[bot])

Misc

• Remove vendor directory (#1387 by @ChenYi015)

[cheyang]

/lgtm
/approve

[google-oss-prow]

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