Update dependency @stryker-mutator/core to v5.6.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@stryker-mutator/core (source)	5.6.0 → 5.6.1

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Release Notes

stryker-mutator/stryker-js (@​stryker-mutator/core)

v5.6.1

Compare Source

Bug Fixes

• deps: remove vulnerability by updating log4js (#​3372) (69290f2), closes /github.com/log4js-node/log4js-node/blob/master/CHANGELOG.md#640

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