Update dependencied and required code to allow running it on new Vagrant

[ingwarsw]

This pull request updates the project to support newer dependencies, modernizes the Ruby version, and introduces a minor feature improvement. The most significant changes are upgrading the fog-google dependency, updating the supported Ruby version, and adding a new default for resource_policies in configuration tests.

Dependency and compatibility updates:

• Upgraded the fog-google gem dependency to version ~> 1.25.0 in vagrant-google.gemspec to ensure compatibility with newer versions.
• Updated the Ruby version used in CI and development from 2.7.4 to 3.4, and removed the specific Ruby version label in .github/workflows/ci.yml.

Code and API adjustments for updated dependencies:

• Updated references to Fog error classes from Fog::Compute::Google::* to Fog::Google::Compute::* in lib/vagrant-google/action/run_instance.rb and lib/vagrant-google/action/start_instance.rb to match the new fog-google gem API. [1] [2]

Feature and test improvements:

• Added a test to verify that the default value for resource_policies is an empty array in test/unit/common/config_test.rb.

Versioning:

• Bumped the plugin version from 2.7.0 to 2.8.0 in lib/vagrant-google/version.rb.

[ingwarsw]

@Temikus Im not sure if your still maintainer here but would be cool to merge this and release new version of the plugin.

[ShubhamRasal]

@Temikus Im not sure if your still maintainer here but would be cool to merge this and release new version of the plugin.

yeah.. it would be really helpful