fix(deps): update module github.com/hashicorp/terraform-plugin-mux to v0.20.0 (elastic#1148)

Co-authored-by: elastic-renovate-prod[bot] <174716857+elastic-renovate-prod[bot]@users.noreply.github.com>

Author: elastic-renovate-prod[bot]

go.mod

@@ -15,9 +15,9 @@ require (
 	github.com/hashicorp/terraform-plugin-framework v1.15.0
 	github.com/hashicorp/terraform-plugin-framework-jsontypes v0.2.0
 	github.com/hashicorp/terraform-plugin-framework-validators v0.18.0
-	github.com/hashicorp/terraform-plugin-go v0.27.0
+	github.com/hashicorp/terraform-plugin-go v0.28.0
 	github.com/hashicorp/terraform-plugin-log v0.9.0
-	github.com/hashicorp/terraform-plugin-mux v0.19.0
+	github.com/hashicorp/terraform-plugin-mux v0.20.0
 	github.com/hashicorp/terraform-plugin-sdk/v2 v2.37.0
 	github.com/mitchellh/mapstructure v1.5.0
 	github.com/oapi-codegen/oapi-codegen/v2 v2.4.1

go.sum

@@ -100,12 +100,12 @@ github.com/hashicorp/terraform-plugin-framework-jsontypes v0.2.0 h1:SJXL5FfJJm17
 github.com/hashicorp/terraform-plugin-framework-jsontypes v0.2.0/go.mod h1:p0phD0IYhsu9bR4+6OetVvvH59I6LwjXGnTVEr8ox6E=
 github.com/hashicorp/terraform-plugin-framework-validators v0.18.0 h1:OQnlOt98ua//rCw+QhBbSqfW3QbwtVrcdWeQN5gI3Hw=
 github.com/hashicorp/terraform-plugin-framework-validators v0.18.0/go.mod h1:lZvZvagw5hsJwuY7mAY6KUz45/U6fiDR0CzQAwWD0CA=
-github.com/hashicorp/terraform-plugin-go v0.27.0 h1:ujykws/fWIdsi6oTUT5Or4ukvEan4aN9lY+LOxVP8EE=
-github.com/hashicorp/terraform-plugin-go v0.27.0/go.mod h1:FDa2Bb3uumkTGSkTFpWSOwWJDwA7bf3vdP3ltLDTH6o=
+github.com/hashicorp/terraform-plugin-go v0.28.0 h1:zJmu2UDwhVN0J+J20RE5huiF3XXlTYVIleaevHZgKPA=
+github.com/hashicorp/terraform-plugin-go v0.28.0/go.mod h1:FDa2Bb3uumkTGSkTFpWSOwWJDwA7bf3vdP3ltLDTH6o=
 github.com/hashicorp/terraform-plugin-log v0.9.0 h1:i7hOA+vdAItN1/7UrfBqBwvYPQ9TFvymaRGZED3FCV0=
 github.com/hashicorp/terraform-plugin-log v0.9.0/go.mod h1:rKL8egZQ/eXSyDqzLUuwUYLVdlYeamldAHSxjUFADow=
-github.com/hashicorp/terraform-plugin-mux v0.19.0 h1:F2QxnHfsvdoWbF7EWeEHA+sfmBetlW5pipq+zWnVdIc=
-github.com/hashicorp/terraform-plugin-mux v0.19.0/go.mod h1:MO+7zYzrMz2Ohc5r8m7sM6YT+F8ET4lgYKe2GhiYW0g=
+github.com/hashicorp/terraform-plugin-mux v0.20.0 h1:3QpBnI9uCuL0Yy2Rq/kR9cOdmOFNhw88A2GoZtk5aXM=
+github.com/hashicorp/terraform-plugin-mux v0.20.0/go.mod h1:wSIZwJjSYk86NOTX3fKUlThMT4EAV1XpBHz9SAvjQr4=
 github.com/hashicorp/terraform-plugin-sdk/v2 v2.37.0 h1:NFPMacTrY/IdcIcnUB+7hsore1ZaRWU9cnB6jFoBnIM=
 github.com/hashicorp/terraform-plugin-sdk/v2 v2.37.0/go.mod h1:QYmYnLfsosrxjCnGY1p9c7Zj6n9thnEE+7RObeYs3fA=
 github.com/hashicorp/terraform-registry-address v0.2.5 h1:2GTftHqmUhVOeuu9CW3kwDkRe4pcBDq0uuK5VJngU1M=