chore: remove Java 8 from v2 examples

[jdoherty]

Issue #1466

Description of changes:

Removed Java 8 from all examples.
Deployed and smoke tested all examples using Java 11 updating some README files as I went

Checklist

• Meet tenets criteria
• Update tests
• Update docs
• PR title follows conventional commit semantics

Breaking change checklist

RFC issue #:

• Migration process documented
• Implement warnings (if it can live side by side)

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[github-actions]

💾 Artifacts Size Report

Module	Version	Size (KB)
powertools-common	2.0.0-SNAPSHOT	9.96
powertools-serialization	2.0.0-SNAPSHOT	16.94
powertools-logging	2.0.0-SNAPSHOT	45.80
powertools-tracing	2.0.0-SNAPSHOT	13.43
powertools-metrics	2.0.0-SNAPSHOT	14.29
powertools-parameters	2.0.0-SNAPSHOT	41.01
powertools-validation	2.0.0-SNAPSHOT	18.82
powertools-cloudformation	2.0.0-SNAPSHOT	16.82
powertools-idempotency	2.0.0-SNAPSHOT	43.31
powertools-large-messages	2.0.0-SNAPSHOT	17.65
powertools-batch	2.0.0-SNAPSHOT	16.88
powertools-examples-core-utilities-sam	2.0.0-SNAPSHOT	13640.27
powertools-examples-core-utilities-serverless	2.0.0-SNAPSHOT	13637.72

[scottgerring]

Nice! One little thing on the spotbugs build config but otherwise looks good 🙏 Thanks for cleaning up the docs + examples where you came across issues too!

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (v2@e7757c7). Click here to learn what that means.

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Additional details and impacted files

@@          Coverage Diff          @@
##             v2    #1531   +/-   ##
=====================================
  Coverage      ?   77.75%           
  Complexity    ?      623           
=====================================
  Files         ?       83           
  Lines         ?     2504           
  Branches      ?      270           
=====================================
  Hits          ?     1947           
  Misses        ?      469           
  Partials      ?       88           

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[scottgerring]

LGTM!