Splunk Operator: replace aws-sdk-go with aws-sdk-go-v2

[narimanu]

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Deprecating module

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Describe the request

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  Currently aws-sdk-go v1 is used in the project, which is scheduled for end-of-support on July 31, 2025

Expected behavior

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  Replace aws-sdk-go with aws-sdk-go-v2

Splunk setup on K8S

• Details of the Splunk setup on the K8s cluster.

Reproduction/Testing steps

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K8s environment

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Proposed changes(optional)

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K8s collector data(optional)

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Additional context(optional)

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