resource/aws_vpn_connection: Fixes CIDR validation for inside_ipv6_cidr fields

[erikjoh]

Description

Fixes incorrect regex to properly allow any CIDR in fd00::/8 (the current regex incorrectly only allows CIDRs from fd00::/16).

Relations

Closes #36232

References

Output from Acceptance Testing

% make testacc TESTS=TestAccSiteVPNConnection_tunnel1InsideIPv6CIDR PKG=ec2
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ec2/... -v -count 1 -parallel 20 -run='TestAccSiteVPNConnection_tunnel1InsideIPv6CIDR'  -timeout 360m
=== RUN   TestAccSiteVPNConnection_tunnel1InsideIPv6CIDR
=== PAUSE TestAccSiteVPNConnection_tunnel1InsideIPv6CIDR
=== CONT  TestAccSiteVPNConnection_tunnel1InsideIPv6CIDR
--- PASS: TestAccSiteVPNConnection_tunnel1InsideIPv6CIDR (405.46s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ec2	405.565s
...

[github-actions]

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[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccSiteVPNConnection_tunnel1InsideIPv6CIDR\|TestAccSiteVPNConnection_basic' PKG=ec2
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ec2/... -v -count 1 -parallel 20  -run=TestAccSiteVPNConnection_tunnel1InsideIPv6CIDR\|TestAccSiteVPNConnection_basic -timeout 360m
=== RUN   TestAccSiteVPNConnection_basic
=== PAUSE TestAccSiteVPNConnection_basic
=== RUN   TestAccSiteVPNConnection_tunnel1InsideIPv6CIDR
=== PAUSE TestAccSiteVPNConnection_tunnel1InsideIPv6CIDR
=== CONT  TestAccSiteVPNConnection_basic
=== CONT  TestAccSiteVPNConnection_tunnel1InsideIPv6CIDR
--- PASS: TestAccSiteVPNConnection_basic (240.24s)
--- PASS: TestAccSiteVPNConnection_tunnel1InsideIPv6CIDR (444.93s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ec2	453.508s

[ewbankkit]

@erikjoh Thanks for the contribution 🎉 👏.

[github-actions]

This functionality has been released in v5.41.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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