RFR: JDK-8296619: Upgrade jQuery from 3.6.0 to 3.6.1

[Hannes Wallnöfer]

Please review a change to upgrade the jQuery JS library used by javadoc from 3.6.0 to 3.6.1. The files (uncompressed and compressed) were obtained from https://jquery.com/download/. 

I tested the generated API documentation in the browsers and ran the test suite including the manual TestSearchScript test.

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Commit messages:
 - JDK-8296619: Upgrade jQuery from 3.6.0 to 3.6.1

Changes: https://git.openjdk.org/jdk/pull/11138/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11138&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8296619
  Stats: 143 lines in 7 files changed: 41 ins; 13 del; 89 mod
  Patch: https://git.openjdk.org/jdk/pull/11138.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11138/head:pull/11138

PR: https://git.openjdk.org/jdk/pull/11138