deps: Update dependency @azure-tools/typespec-client-generator-core to v0.68.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@azure-tools/typespec-client-generator-core (source)	0.68.2 → 0.68.3

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Release Notes

Azure/typespec-azure (@​azure-tools/typespec-client-generator-core)

v0.68.3

Compare Source

Bug Fixes

• #​4508 Fix orphan type ordering so that models are always processed before unions, ensuring anonymous model variants inside unions get their generated name from the model property context rather than the union context. This restores the naming behavior from 0.68.0 that was inadvertently changed in 0.68.1.
• #​4501 Fix "Cannot read properties of undefined" crash in the inconsistent-multiple-service-dependency validation when a service merged into a multi-service client does not specify a version for a depended library (e.g. its latest service version has no matching @useDependency entry). The validation now falls back to the latest version of the depended library, matching the behavior of downstream emitters.

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