Update dependency keycloak-js to v15

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
keycloak-js (source)	12.0.4 -> 15.1.0

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Release Notes

keycloak/keycloak

v15.1.0

Compare Source

v15.0.2

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v15.0.1

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v15.0.0

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v14.0.0

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v13.0.1

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v13.0.0

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Configuration

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