chore: rename google-cloud-public-ca to google-cloud-security-publicca

[parthea]

Since May 2024, google-cloud-public-ca has been published under https://pypi.org/project/google-cloud-security-publicca/#history

This PR renames the directory to reflect the package on PyPI that is up to date. See #14633 to follow up on deprecating google-cloud-public-ca

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• packages/google-cloud-security-publicca/samples/generated_samples/publicca_v1_generated_public_certificate_authority_service_create_external_account_key_async.py:26, tag publicca_v1_generated_PublicCertificateAuthorityService_CreateExternalAccountKey_async
• packages/google-cloud-security-publicca/samples/generated_samples/publicca_v1_generated_public_certificate_authority_service_create_external_account_key_sync.py:26, tag publicca_v1_generated_PublicCertificateAuthorityService_CreateExternalAccountKey_sync
• packages/google-cloud-security-publicca/samples/generated_samples/publicca_v1beta1_generated_public_certificate_authority_service_create_external_account_key_async.py:26, tag publicca_v1beta1_generated_PublicCertificateAuthorityService_CreateExternalAccountKey_async
• packages/google-cloud-security-publicca/samples/generated_samples/publicca_v1beta1_generated_public_certificate_authority_service_create_external_account_key_sync.py:26, tag publicca_v1beta1_generated_PublicCertificateAuthorityService_CreateExternalAccountKey_sync

You are about to delete 4 region tags.

• packages/google-cloud-public-ca/samples/generated_samples/publicca_v1_generated_public_certificate_authority_service_create_external_account_key_async.py:26, tag publicca_v1_generated_PublicCertificateAuthorityService_CreateExternalAccountKey_async
• packages/google-cloud-public-ca/samples/generated_samples/publicca_v1_generated_public_certificate_authority_service_create_external_account_key_sync.py:26, tag publicca_v1_generated_PublicCertificateAuthorityService_CreateExternalAccountKey_sync
• packages/google-cloud-public-ca/samples/generated_samples/publicca_v1beta1_generated_public_certificate_authority_service_create_external_account_key_async.py:26, tag publicca_v1beta1_generated_PublicCertificateAuthorityService_CreateExternalAccountKey_async
• packages/google-cloud-public-ca/samples/generated_samples/publicca_v1beta1_generated_public_certificate_authority_service_create_external_account_key_sync.py:26, tag publicca_v1beta1_generated_PublicCertificateAuthorityService_CreateExternalAccountKey_sync

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