v1.21.0

What's Changed

• [main] Update community files by @knative-automation in #438
• [main] Update community files by @knative-automation in #440
• [main] Update community files by @knative-automation in #441
• [main] Update community files by @knative-automation in #442
• [main] Update community files by @knative-automation in #443
• [main] Update community files by @knative-automation in #444
• [main] Upgrade to latest dependencies by @knative-automation in #439
• [main] Upgrade to latest dependencies by @knative-automation in #445
• [main] Upgrade to latest dependencies by @knative-automation in #446
• [main] Upgrade to latest dependencies by @knative-automation in #447
• [main] Upgrade to latest dependencies by @knative-automation in #448
• [main] Upgrade to latest dependencies by @knative-automation in #449
• [main] Upgrade to latest dependencies by @knative-automation in #450
• [main] Upgrade to latest dependencies by @knative-automation in #451
• [main] Upgrade to latest dependencies by @knative-automation in #452
• [main] Upgrade to latest dependencies by @knative-automation in #453
• [main] Upgrade to latest dependencies by @knative-automation in #454
• [main] Upgrade to latest dependencies by @knative-automation in #455
• [main] Upgrade to latest dependencies by @knative-automation in #456

Full Changelog: knative-v1.20.0...knative-v1.21.0