Bump geocoder from 1.8.0 to 1.8.1

Bumps geocoder from 1.8.0 to 1.8.1.

Changelog

Sourced from geocoder's changelog.

1.8.1 (2022 Sep 23)

• Add support for IPBase lookup (thanks github.com/jonallured).
• Test cleanup (thanks github.com/jonallured).
• Prevent errors when existing constant name shadows a lookup class (thanks github.com/avram-twitch).

Commits

• e82f09a Prepare for release of gem version 1.8.1.
• 9f7d485 Merge pull request #1588 from avram-twitch/fixes-shadowed-lookup-class-name-bug
• 9e91043 Merge pull request #1591 from Intrepidd/geoapify-autocomplete
• c117350 Allow geoapify lookup to perform autocomplete query
• 145991b Refactor test to use mock lookup
• 312a5bb Fixes errors occurring when existing constant name shadows a lookup class name
• c3e3a8d Add support for ipbase lookups (#1584)
• 53b3bdd Remove teardown methods from lookup tests.
• d03d7c7 Fix test that fails intermittently.
• e06076f Downcase search string (to match filename).
• Additional commits viewable in compare view