fix: add wait/depends on for cos auth policy

[MatthewLemmond]

Description

add explicit depends on for the auth policy between the cloud logs instance and the COS bucket

resolves https://github.com/terraform-ibm-modules/terraform-ibm-observability-instances/issues/587

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[MatthewLemmond]

/run pipeline

[MatthewLemmond]

/run pipeline

[terraform-ibm-modules-ops]

:tada: This PR is included in version 3.0.2 :tada:

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