PHPLIB-1818: Support regex in $replaceOne find argument

[GromNaN]

• Adds resolvesToRegex to the find argument of $replaceOne, mirroring the existing support in $replaceAll
• Updates the mql-specifications submodule to DRIVERS-3235 Support regex in $replaceOne find argument mql-specifications#49

Jira: https://jira.mongodb.org/browse/PHPLIB-1818

[Copilot]

Pull request overview

This PR extends the aggregation expression builder to allow $replaceOne’s find argument to resolve to a regex (matching $replaceAll’s existing behavior), and adds a regression test + expected pipeline fixture for the regex example.

Changes:

• Widened $replaceOne find typing to accept MongoDB\BSON\Regex / ResolvesToRegex.
• Added a $replaceOne “replace using regex” pipeline fixture and corresponding unit test.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

File	Description
tests/Builder/Expression/ReplaceOneOperatorTest.php	Adds a new test covering Expression::replaceOne() with a Regex find value.
tests/Builder/Expression/Pipelines.php	Adds expected JSON for the $replaceOne “Replace Using Regex” example.
src/Builder/Expression/ReplaceOneOperator.php	Updates the operator’s find union type to accept regex inputs.
src/Builder/Expression/FactoryTrait.php	Updates the Expression::replaceOne() factory signature to accept regex inputs.

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated no new comments.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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