deps: update module github.com/hashicorp/terraform-plugin-mux to v0.15.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/hashicorp/terraform-plugin-mux	v0.14.0 -> v0.15.0

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Release Notes

hashicorp/terraform-plugin-mux (github.com/hashicorp/terraform-plugin-mux)

v0.15.0

Compare Source

ENHANCEMENTS:

• all: Upgrade protocol versions to support modified CallFunction RPC which returns a FunctionError rather than Diagnostics (#​226)

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