Update JDK 11 Dockerfile Checksums

[harrisd19]

Updating checksums for version 11.0.20 JDK downloads as per oracle website.

https://www.oracle.com/a/tech/docs/11-0-20-checksum.html

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[aureliogrb]

Thanks for the pull request @harrisd19. It was correct, but was superseded by https://github.com/oracle/docker-images/pull/2671/ which include this and other updates before this one was reviewed.