handle http_protocol_ipv6 metadata in data_source_launch_template

[ghdiska]

In data_source for launch template is missing new metadata http_protocol_ipv6.

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Closes #21007

Output from acceptance testing:

Sorry i was not able to run test ( my dev environment fault )

$ make testacc TESTARGS='-run=TestAccXXX'

...

[anGie44]

Thank you for this fix @ghdiska, LGTM 🚀

Output of acceptance tests:

--- PASS: TestAccAWSLaunchTemplateDataSource_NonExistent (3.85s)
--- PASS: TestAccAWSLaunchTemplateDataSource_enclaveOptions (24.01s)
--- PASS: TestAccAWSLaunchTemplateDataSource_metadataOptions (24.03s)
--- PASS: TestAccAWSLaunchTemplateDataSource_basic (24.06s)
--- PASS: TestAccAWSLaunchTemplateDataSource_id_basic (24.21s)
--- PASS: TestAccAWSLaunchTemplateDataSource_filter_tags (24.22s)
--- PASS: TestAccAWSLaunchTemplateDataSource_filter_basic (24.24s)
--- PASS: TestAccAWSLaunchTemplateDataSource_networkInterfaces_deleteOnTermination (55.79s)
--- PASS: TestAccAWSLaunchTemplateDataSource_associatePublicIPAddress (55.95s)
--- PASS: TestAccAWSLaunchTemplateDataSource_associateCarrierIPAddress (55.98s)

[github-actions]

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[github-actions]

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