chore(deps): bump pkg pins for PurchaseResult.ExistingCommitment

[cristim]

Bumps the pkg pin to 90e61e6 (v0.0.0-20261006104817-90e61e668b99, from #261) in providers/aws, providers/azure, providers/gcp and ci_cd_sanity_tests, so providers can reference common.PurchaseResult.ExistingCommitment. go.mod and go.sum only, same method as #250.

Refs #211

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Reviewing files that changed from the base of the PR and between 90e61e6 and b69c140.

⛔ Files ignored due to path filters (4)

• ci_cd_sanity_tests/go.sum is excluded by !**/*.sum
• providers/aws/go.sum is excluded by !**/*.sum
• providers/azure/go.sum is excluded by !**/*.sum
• providers/gcp/go.sum is excluded by !**/*.sum

📒 Files selected for processing (4)

• ci_cd_sanity_tests/go.mod
• providers/aws/go.mod
• providers/azure/go.mod
• providers/gcp/go.mod

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