Bump undertow-core from 1.4.0.Final to 2.1.6.Final in /samples/server/petstore/java-undertow

Created by: dependabot[bot]

Bumps undertow-core from 1.4.0.Final to 2.1.6.Final.

Commits

• 152200b Prepare 2.1.6.Final
• d4776a0 Merge pull request #1035 from fl4via/UNDERTOW-1839_2.1.x
• 2792ae6 Merge pull request #1033 from fl4via/UNDERTOW-1780_2.1.x
• 37a3b64 [UNDERTOW-1839][JBEAP-20636] SSLConduit: synchronize on doWrap/doUnwrap/close...
• cb6cdc4 [UNDERTOW-1780][JBEAP-18537] Validating request headers in HTTP2 frames
• b7a5f99 [UNDERTOW-1828] NullPointerException occurred if a servlet calls Http… (#1030)
• 39ead6b Merge pull request #1016 from fl4via/UNDERTOW-1419_2.1.X
• abe724d [UNDERTOW-1827] At InMemorySessionManager.Session.requestStarted, bumpTimeout.
• a2d9f6c Next is 2.1.6.Final
• 2e37225 Prepare 2.1.5.Final
• Additional commits viewable in compare view

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