Update release matrix based on 9.1.0 and 8.19.0 releases

[donoghuc]

This commit updates the releases matrix to point to the new minor releases.

[github-actions]

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[mergify]

This pull request does not have a backport label. Could you fix it @donoghuc? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit.
• If no backport is necessary, please add the backport-skip label

[donoghuc]

are we ready to drop 8.17?

[robbavey]

given that we don't have the ability to have an 8.previous-1, then yes. I'd rather see us test against 8.18 and 8.19 instead of 8.17 and 8.19

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarQube

[robbavey]

LGTM

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 857b06b

Failed CI Steps

• 🥼 Integration Tests - FIPS mode / part 1-of-3
• 🥼 Integration Tests - FIPS mode / part 1-of-3

[donoghuc]

I was waiting to make sure all the DRA builds for 8.19.1 and 9.1.1 are ready. Seem to be in place. Going to merge this and monitor for any issues with the newly added streams.