[Release] v7.21.0

[github-actions]

What's Changed

• build(deps): bump actions/setup-node from 6.0.0 to 6.2.0 by @dependabot[bot] in build(deps): bump actions/setup-node from 6.0.0 to 6.2.0 #4796
• test: restore global dispatcher after fetch tests by @mcollina in test: restore global dispatcher after fetch tests #4790
• Add missing close method to WebSocketStream interface by @piotr-cz in Add missing close method to WebSocketStream interface #4802
• fix: error stream instead of canceling by @KhafraDev in fix: error stream instead of canceling #4804
• Fix clientTtl cleanup race in Agent by @mcollina in Fix clientTtl cleanup race in Agent #4807
• feat(Expose HTTP/2 ping #4230): Implement pingInterval for dispatching PING frames by @metcoder95 in feat(#4230): Implement pingInterval for dispatching PING frames #4296
• fix: handle undefined __filename in bundled environments by @mcollina in fix: handle undefined __filename in bundled environments #4812
• fix: set finalizer only for fetch responses by @tsctx in fix: set finalizer only for fetch responses #4803

New Contributors

• @piotr-cz made their first contribution in Add missing close method to WebSocketStream interface #4802

Full Changelog: v7.20.0...v7.21.0

[mcollina]

lgtm