Upgraded pandas from version 1.5.3 to 2.0.3 to ensure compatibility with the latest libraries

[Yerzhaisang]

Description

Upgraded pandas from 1.5.0 to the latest one (2.2.3). Replaced deprecated methods with custom ones.

Issues Resolved

Closes https://github.com/opensearch-project/opensearch-py-ml/issues/270

Check List

• [x] New functionality includes testing.
  • [x] All tests pass
• [x] New functionality has been documented.
• [x] Commits are signed per the DCO using --signoff

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