Bump excon from 0.110.0 to 1.2.8 (heroku#1627)

Bumps [excon](https://github.com/excon/excon) from 0.110.0 to 1.2.8.
- [Changelog](https://github.com/excon/excon/blob/master/changelog.txt)
- [Commits](excon/excon@v0.110.0...v1.2.8)

---
updated-dependencies:
- dependency-name: excon
  dependency-version: 1.2.8
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -6,7 +6,8 @@ GEM
     connection_pool (2.5.3)
     diff-lcs (1.6.2)
     erubis (2.7.0)
-    excon (0.110.0)
+    excon (1.2.8)
+      logger
     heroics (0.1.3)
       base64
       erubis (~> 2.0)
@@ -21,6 +22,7 @@ GEM
       thor (~> 1)
       threaded (~> 0)
     json (2.13.2)
+    logger (1.7.0)
     moneta (1.0.0)
     multi_json (1.17.0)
     parallel (1.27.0)