fix(deps): update module github.com/hashicorp/terraform-plugin-mux to v0.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/hashicorp/terraform-plugin-mux	v0.20.0 → v0.21.0

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Release Notes

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

v0.21.0

Compare Source

NOTES:

• all: This Go module has been updated to Go 1.24 per the Go support policy. It is recommended to review the Go 1.24 release notes before upgrading. Any consumers building on earlier Go versions may experience errors. (#​324)

FEATURES:

• all: Upgraded mux server implementations to support action types. (#​314)
• all: Upgraded mux server implementations to support the new list. (#​313)

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Configuration

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[renovate]

ℹ️ Artifact update notice

File name: go.mod

In order to perform the update(s) described in the table above, Renovate ran the go get command, which resulted in the following additional change(s):

• 18 additional dependencies were updated
• The go directive was updated for compatibility reasons

Details:

Package	Change
go	1.23.0 -> 1.24.0
github.com/hashicorp/terraform-plugin-go	v0.28.0 -> v0.29.0
golang.org/x/oauth2	v0.26.0 -> v0.30.0
github.com/davecgh/go-spew	v1.1.1 -> v1.1.2-0.20180830191138-d8f796af33cc
github.com/hashicorp/go-plugin	v1.6.3 -> v1.7.0
github.com/hashicorp/terraform-registry-address	v0.2.5 -> v0.4.0
github.com/hashicorp/yamux	v0.1.1 -> v0.1.2
github.com/oklog/run	v1.0.0 -> v1.1.0
github.com/pmezard/go-difflib	v1.0.0 -> v1.0.1-0.20181226105442-5d4384ee4fb2
golang.org/x/crypto	v0.39.0 -> v0.41.0
golang.org/x/mod	v0.25.0 -> v0.26.0
golang.org/x/net	v0.40.0 -> v0.43.0
golang.org/x/sync	v0.15.0 -> v0.16.0
golang.org/x/sys	v0.33.0 -> v0.35.0
golang.org/x/text	v0.26.0 -> v0.28.0
golang.org/x/tools	v0.33.0 -> v0.35.0
google.golang.org/genproto/googleapis/rpc	v0.0.0-20250218202821-56aae31c358a -> v0.0.0-20250707201910-8d1bb00bc6a7
google.golang.org/grpc	v1.72.1 -> v1.75.1
google.golang.org/protobuf	v1.36.6 -> v1.36.9

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.33%. Comparing base (14fb149) to head (7f66bd8).

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #960       +/-   ##
===========================================
+ Coverage   29.40%   58.33%   +28.92%     
===========================================
  Files         246      246               
  Lines       28414    28414               
===========================================
+ Hits         8355    16575     +8220     
+ Misses      19905    11091     -8814     
- Partials      154      748      +594     

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