Current load balancer module blocks update to Google provider >= 6

This module embeds use of version 9 of the load balancer module from Google. This is very old. The latest is version 12.

This blocks downstream users from upgrading to version 6 or better of the Google provider:

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│ Error: Failed to query available provider packages
│ 
│ Could not retrieve the list of available versions for provider hashicorp/google-beta: no available releases match the given constraints >= 3.63.0, >= 4.50.0, ~> 5.0, >= 5.25.0, >= 6.0.0, < 6.0.0, < 7.0.0
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│ Error: Failed to query available provider packages
│ 
│ Could not retrieve the list of available versions for provider hashicorp/google: no available releases match the given constraints >= 3.54.0, >= 3.63.0, >= 4.0.0, >= 4.50.0, ~> 5.0, >= 5.25.0, >= 6.0.0, < 6.0.0, < 7.0.0
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