net-im/prosody: Update to upstream release 0.11.12

Details:

• Changelog see https://blog.prosody.im/prosody-0.11.12-released
• Fixes a denial of service vulnerability (CVE-2022-0217)

PR: 261209
Reported by: thomas@beingboiled.info (maintainer)
MFH: 2022Q1
Security: CVE-2022-0217

(cherry picked from commit 73a52bb768b49b4a433411571f82bb910c2f577b)