Bump sorcery from 0.16.3 to 0.16.4

Bumps [sorcery](https://github.com/Sorcery/sorcery) from 0.16.3 to 0.16.4.
- [Release notes](https://github.com/Sorcery/sorcery/releases)
- [Changelog](https://github.com/Sorcery/sorcery/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Sorcery/sorcery/compare/v0.16.3...v0.16.4)

---
updated-dependencies:
- dependency-name: sorcery
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -171,6 +171,7 @@ GEM
       tilt
     hana (1.3.7)
     hashdiff (1.0.1)
+    hashie (5.0.0)
     headless (2.3.1)
     highline (2.0.3)
     http-accept (1.7.0)
@@ -275,12 +276,13 @@ GEM
     nyan-cat-formatter (0.12.0)
       rspec (>= 2.99, >= 2.14.2, < 4)
     oauth (0.5.14)
-    oauth2 (1.4.11)
+    oauth2 (2.0.9)
       faraday (>= 0.17.3, < 3.0)
       jwt (>= 1.0, < 3.0)
-      multi_json (~> 1.3)
       multi_xml (~> 0.5)
       rack (>= 1.2, < 4)
+      snaky_hash (~> 2.0)
+      version_gem (~> 1.1)
     pagedown-bootstrap-rails (2.1.4)
       railties (> 3.1)
     parallel (1.22.1)
@@ -477,10 +479,13 @@ GEM
       actionpack (>= 3.1)
       railties (>= 3.1)
       slim (>= 3.0, < 5.0)
-    sorcery (0.16.3)
+    snaky_hash (2.0.1)
+      hashie
+      version_gem (~> 1.1, >= 1.1.1)
+    sorcery (0.16.4)
       bcrypt (~> 3.1)
       oauth (~> 0.5, >= 0.5.5)
-      oauth2 (~> 1.0, >= 0.8.0)
+      oauth2 (~> 2.0)
     sorted_set (1.0.3)
       rbtree
       set (~> 1.0)
@@ -512,6 +517,7 @@ GEM
     unf_ext (0.0.8.2)
     unicode-display_width (2.3.0)
     uri_template (0.7.0)
+    version_gem (1.1.1)
     web-console (4.2.0)
       actionview (>= 6.0.0)
       activemodel (>= 6.0.0)