Sets the minimum supported WordPress version to 6.3.

[thijsoo]

Summary

This PR can be summarized in the following changelog entry:

• Sets the minimum supported WordPress version to 6.3.

Relevant technical choices:

*

Test instructions

This PR can be tested by following these steps:

*

Fixes #

[coveralls]

Pull Request Test Coverage Report for Build 7247173538

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 57.143%

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Totals
Change from base Build 7229522368:	0.0%
Covered Lines:	172
Relevant Lines:	301

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💛 - Coveralls