Bump undertow-core from 2.1.6.Final to 2.2.15.Final in /samples/server/petstore/java-undertow

Created by: dependabot[bot]

Bumps undertow-core from 2.1.6.Final to 2.2.15.Final.

Commits

• c0b0d33 Prepare 2.2.15.Final
• a3aebce Merge pull request #1290 from carterkozak/UNDERTOW-2019
• 8531ff7 Merge pull request #1277 from gaol/test_undertow-1981
• cda3aae Merge pull request #1289 from carterkozak/UNDERTOW-2018
• 19a17fe Merge pull request #1288 from carterkozak/UNDERTOW-2017
• c5298bd Merge pull request #1283 from baranowb/UNDERTOW-2012
• ad3c5db Merge pull request #1281 from Ortus-Solutions/dev/undertow-2011
• afb3e12 Merge pull request #1280 from aogburn/03102603
• cd40388 [UNDERTOW-2025][UNDERTOW-1981] Test that client cannot access files inside of...
• 7b5681b Merge pull request #1274 from baranowb/UNDERTOW-1994
• Additional commits viewable in compare view

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