Bump OpenSearch version in README for open issues

[cwperks]

Description

Updates the open issues tag in the README from 2.10.0 -> 2.14.0.

See companion PR to update to version increment logic so that this value also gets updated with automation during a version increment: #12894

Related Issues

• [Version Bump Bot] Enhance the version bump bot to update the version in README and CHANGELOG #8851

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Failing checks are inspected and point to the corresponding known issue(s) (See: Troubleshooting Failing Builds)
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)
• Public documentation issue/PR created

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions]

Compatibility status:

Checks if related components are compatible with change 2a78a68

Incompatible components

Skipped components

Compatible components

Compatible components: [https://github.com/opensearch-project/custom-codecs.git, https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/performance-analyzer-rca.git, https://github.com/opensearch-project/flow-framework.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/reporting.git, https://github.com/opensearch-project/cross-cluster-replication.git, https://github.com/opensearch-project/security.git, https://github.com/opensearch-project/opensearch-oci-object-storage.git, https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/k-nn.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/neural-search.git, https://github.com/opensearch-project/anomaly-detection.git, https://github.com/opensearch-project/security-analytics.git, https://github.com/opensearch-project/performance-analyzer.git, https://github.com/opensearch-project/ml-commons.git, https://github.com/opensearch-project/notifications.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/alerting.git, https://github.com/opensearch-project/sql.git]

[github-actions]

✅ Gradle check result for 2a78a68: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.38%. Comparing base (b15cb0c) to head (2a78a68).
Report is 83 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #12895      +/-   ##
============================================
- Coverage     71.42%   71.38%   -0.04%     
- Complexity    59978    60234     +256     
============================================
  Files          4985     5011      +26     
  Lines        282275   283675    +1400     
  Branches      40946    41117     +171     
============================================
+ Hits         201603   202515     +912     
- Misses        63999    64376     +377     
- Partials      16673    16784     +111     

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