Update lscr.io/linuxserver/prowlarr Docker tag to v1.21.2

This PR contains the following updates:

Package	Update	Change
lscr.io/linuxserver/prowlarr (source)	minor	`1.20.1` -> `1.21.2`

linuxserver/docker-prowlarr (lscr.io/linuxserver/prowlarr)

### [`v1.21.2`](https://togithub.com/linuxserver/docker-prowlarr/compare/1.20.1.4603-ls78...nightly-1.21.2.4632-ls30)

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McMumf / Homelab