chore(iot_indexing_configuration): fix reserved shadow regex

[EttoreFoti]

Description

Add missing '$' to regex validation

Relations

Closes #35201

Output from Acceptance Testing

❯ make testacc TESTARGS="-run=TestAccIoTIndexingConfiguration_serial" PKG=iot
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/iot/... -v -count 1 -parallel 20  -run=TestAccIoTIndexingConfiguration_serial -timeout 360m
=== RUN   TestAccIoTIndexingConfiguration_serial
=== PAUSE TestAccIoTIndexingConfiguration_serial
=== CONT  TestAccIoTIndexingConfiguration_serial
=== RUN   TestAccIoTIndexingConfiguration_serial/basic
=== RUN   TestAccIoTIndexingConfiguration_serial/allAttributes
--- PASS: TestAccIoTIndexingConfiguration_serial (44.24s)
    --- PASS: TestAccIoTIndexingConfiguration_serial/basic (22.32s)
    --- PASS: TestAccIoTIndexingConfiguration_serial/allAttributes (21.92s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/iot        46.875s

[github-actions]

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[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccIoTIndexingConfiguration_serial/allAttributes' PKG=iot
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/iot/... -v -count 1 -parallel 20  -run=TestAccIoTIndexingConfiguration_serial/allAttributes -timeout 360m
=== RUN   TestAccIoTIndexingConfiguration_serial
=== PAUSE TestAccIoTIndexingConfiguration_serial
=== CONT  TestAccIoTIndexingConfiguration_serial
=== RUN   TestAccIoTIndexingConfiguration_serial/allAttributes
--- PASS: TestAccIoTIndexingConfiguration_serial (17.81s)
    --- PASS: TestAccIoTIndexingConfiguration_serial/allAttributes (17.81s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/iot	23.681s

[ewbankkit]

@EttoreFoti Thanks for the contribution 🎉 👏.

[github-actions]

This functionality has been released in v5.32.0 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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