Bump vnu-jar from 21.6.11 to 21.9.2

Created by: dependabot[bot]

Bumps vnu-jar from 21.6.11 to 21.9.2.

Release notes

Sourced from vnu-jar's releases.

latest

c2cdd4a054360f764ff74022525e3bc457c9feff — Drop some no-longer-needed filters

Commits

• 2022031 Roll back to latest Jetty 9 (9.4.43.v20210629)
• be0bcb0 Revert "Add Jetty backend HTTP/2 support (clear text, h2c)"
• f86bde2 Update css-validator
• 956ed34 Update css-validator
• 11e9ee1 Update Jetty to 10.0.6; javax.servlet-api to 4.0.1
• b1dd328 Update css-validator
• 93c88bd Update css-validator
• f5384f4 Drop another no-longer-needed filter
• 21ea635 Update css-validator; drop some no-longer-needed filters
• 4d79cda Dockerfile: Bump unzip version
• Additional commits viewable in compare view

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