pluto 5.21.1

[BrewTestBot]

Created by brew bump

---

Created with brew bump-formula-pr.

release notes

## Changelog
* d45f6d122de3d99fc4b7576592939ff62655db66 INSIGHTS-592 Fix Pluto vulerabilities (#556)
* 02db56b4e484c734fc34edd44eb9a48505e31744 feat: add flowcontrol v1beta2 removal in 1.32 (#555)
You can verify the signatures of both the checksums.txt file and the published docker images using cosign.
cosign 1.x
cosign verify-blob checksums.txt --signature=checksums.txt.sig  --key https://artifacts.fairwinds.com/cosign.pub

cosign 2.x
cosign verify-blob checksums.txt --signature=checksums.txt.sig  --key https://artifacts.fairwinds.com/cosign.pub --insecure-ignore-tlog

cosign verify us-docker.pkg.dev/fairwinds-ops/oss/pluto:v5 --key https://artifacts.fairwinds.com/cosign.pub

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