feat: release v1.8.0 - Githubissues

This PR will trigger semantic-release to create a v1.8.0 release of terraform-provider-rollbar.

At this point the code is stable and ready for dogfooding at Rollbar.

All future release versions will be determined by semantic-release.

Description of the change

Please include a summary of the change and which issues are fixed. Please also include relevant motivation and context.

[ ] Bug fix (non-breaking change that fixes an issue)
[ ] New feature (non-breaking change that adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
[ ] Maintenance
[ ] New release

Shortcut stories and GitHub issues (delete irrelevant)

[ ] Lint rules pass locally
[ ] The code changed/added as part of this pull request has been covered with tests
[ ] All tests related to the changed code pass in development

[ ] This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
[ ] "Ready for review" label attached to the PR and reviewers assigned
[ ] Issue from task tracker has a link to this pull request
[ ] Changes have been reviewed by at least one other engineer