fix: corrected syntax to connect vpcs using transit gateway.

[imprateeksh]

Description

The errors were seen in pipeline run, made changes to transit gateway's vpc_connections
Reference Issue - #13080

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[imprateeksh]

/run pipeline

[imprateeksh]

Ran the hub and spoke test manually. Sharing the test logs - logs_hub_resolver.txt

[terraform-ibm-modules-ops]

🎉 This PR is included in version 7.21.0 🎉

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• v7.21.0

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