Vpngwconn fix

[uibm]

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Relates OR Closes #5903

Output from acceptance testing:

% make testacc TEST=./ibm/service/vpc TESTARGS='-run=TestAccIBMISVPNGatewayConnection_CIDRUpdates'
=== RUN   TestAccIBMISVPNGatewayConnection_CIDRUpdates
--- PASS: TestAccIBMISVPNGatewayConnection_CIDRUpdates (415.75s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     417.783s

[hFti]

Hello
is it possible to review this MR as it can eventually fix our deployment. without this fix , we are changing manually the peers cidrs and local cidrs which is not convenient.
thank you

[hkantare]

Hi
@uibm Is this PR open for PR review
Any doc changes required