chore(deps): update terraform juju to ~> 0.15.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
juju (source)	required_provider	minor	~> 0.14.0 -> ~> 0.15.0

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Release Notes

juju/terraform-provider-juju (juju)

v0.15.0

Compare Source

NOTES:

• This release requires Juju controller version 2.9.49 or higher juju.
• If using JAAS, this release requires Juju controller version 3.5.0 or higher.
• This release uses juju client api code from the juju 3.5.1 release.

ENHANCEMENTS:

• Support for JAAS access settings via the following new resources:
  • juju_jaas_access_cloud
  • juju_jaas_access_controller
  • juju_jaas_access_group
  • juju_jaas_access_model
  • juju_jaas_access_offer
  • juju_jaas_access_service_account
  • juju_jaas_group
• Support for adding kubernetes clouds to existing controllers with the new
  juju_kubernetes_cloud resource.

BUG FIXES:

• feat: add computed uuid to model resource by @​hmlanigan in #​599
• fix: remove requirement on ca cert by @​kian99 in #​567

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