Update dependency org.quiltmc:quilt-loader to v0.26.4-beta.7

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.quiltmc:quilt-loader	0.26.4-beta.5 -> 0.26.4-beta.7

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[!WARNING] Some dependencies could not be looked up. Check the warning logs for more information.

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