chore(deps): update dependency io.undertow:undertow-core to v2.3.20.final

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
io.undertow:undertow-core (source)	2.3.19.Final -> 2.3.20.Final

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Release Notes

undertow-io/undertow (io.undertow:undertow-core)

v2.3.20.Final

Compare Source

Release 2.3.20.Final fixes CVE-2025-9784
Full list of issues: view in Jira

    Release Notes - Undertow - Version 2.3.20.Final
                                                        

Bug

• [UNDERTOW-2235] - Properly handle non servlet methods dispatched as error into container
• [UNDERTOW-2598] - CVE-2025-9784 MadeYouReset HTTP/2 DDoS Vulnerability
• [UNDERTOW-2604] - 2.3.19 regression w/ Java&#​39;s HTTP client
• [UNDERTOW-2608] - Undertow Servlet 2.3.19 fails SecurityManager checks

Enhancement

• [UNDERTOW-2607] - Syntax error in CONTRIBUTING.md file

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