Update module github.com/oschwald/geoip2-golang to v1.8.0

This MR contains the following updates:

Package	Type	Update	Change
github.com/oschwald/geoip2-golang	require	minor	v1.5.0 -> v1.8.0

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Release Notes

oschwald/geoip2-golang

v1.8.0: 1.8.0

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• Set Go version to 1.18 in go.mod.

v1.7.0: 1.7.0

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• Set the minimum Go version in the go.mod file to 1.17.
• Updated dependencies.

v1.6.1: 1.6.1

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• This is a re-release with the changes that were supposed to be in 1.6.0.

v1.6.0: 1.6.0

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• Add support for new mobile_country_code and mobile_network_code outputs on GeoIP2 ISP and GeoIP2 Enterprise.

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