Applied fix to AttributeError when assigning to "geo_target_constants"

[imshawan]

This pull request addresses an AttributeError encountered while attempting to assign values to the "geo_target_constants" property in the GenerateKeywordIdeasRequest message type.

Before the fix, the code attempted to assign a value directly to the "geo_target_constants" property:

request = client.get_type("GenerateKeywordIdeasRequest")
request.geo_target_constants = location_rns

However, this resulted in an AttributeError, as direct assignment to repeated fields is not allowed in protocol message objects.

To resolve this issue, the code has been updated to properly assign a list of values to the "geo_target_constants" field:

request = client.get_type("GenerateKeywordIdeasRequest")
request.geo_target_constants.extend(location_rns)

This ensures that the values are correctly assigned to the repeated field "geo_target_constants".

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