Build(deps): Bump omniauth from 1.9.1 to 2.1.2

Bumps [omniauth](https://github.com/omniauth/omniauth) from 1.9.1 to 2.1.2.
- [Release notes](https://github.com/omniauth/omniauth/releases)
- [Commits](omniauth/omniauth@v1.9.1...v2.1.2)

---
updated-dependencies:
- dependency-name: omniauth
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Gemfile.lock

@@ -106,6 +106,7 @@ GEM
     debug_inspector (1.1.0)
     diff-lcs (1.5.0)
     diffy (3.4.0)
+    digest (3.0.0)
     discourse-ember-rails (0.18.6)
       active_model_serializers
       ember-data-source (>= 1.0.0.beta.5)
@@ -246,6 +247,18 @@ GEM
     multi_xml (0.6.0)
     multipart-post (2.1.1)
     mustache (1.1.1)
+    net-imap (0.2.4)
+      digest
+      net-protocol
+      strscan
+    net-pop (0.1.2)
+      net-protocol
+    net-protocol (0.2.2)
+      timeout
+    net-smtp (0.2.2)
+      digest
+      net-protocol
+      timeout
     nio4r (2.5.8)
     nokogiri (1.13.3)
       mini_portile2 (~> 2.8.0)
@@ -266,19 +279,20 @@ GEM
       multi_xml (~> 0.5)
       rack (>= 1.2, < 3)
     oj (3.13.11)
-    omniauth (1.9.1)
+    omniauth (2.1.2)
       hashie (>= 3.4.6)
-      rack (>= 1.6.2, < 3)
+      rack (>= 2.2.3)
+      rack-protection
     omniauth-facebook (9.0.0)
       omniauth-oauth2 (~> 1.2)
-    omniauth-github (1.4.0)
-      omniauth (~> 1.5)
-      omniauth-oauth2 (>= 1.4.0, < 2.0)
-    omniauth-google-oauth2 (0.8.2)
+    omniauth-github (2.0.0)
+      omniauth (~> 2.0)
+      omniauth-oauth2 (~> 1.7.1)
+    omniauth-google-oauth2 (1.0.1)
       jwt (>= 2.0)
       oauth2 (~> 1.1)
-      omniauth (~> 1.1)
-      omniauth-oauth2 (>= 1.6)
+      omniauth (~> 2.0)
+      omniauth-oauth2 (~> 1.7.1)
     omniauth-oauth (1.2.0)
       oauth
       omniauth (>= 1.0, < 3)
@@ -452,9 +466,11 @@ GEM
       sprockets (>= 3.0.0)
     sshkey (2.0.0)
     stackprof (0.2.19)
+    strscan (3.1.0)
     test-prof (1.0.7)
     thor (1.2.1)
     tilt (2.0.10)
+    timeout (0.4.1)
     tzinfo (2.0.4)
       concurrent-ruby (~> 1.0)
     uglifier (4.2.0)
@@ -514,6 +530,7 @@ DEPENDENCIES
   cppjieba_rb
   css_parser
   diffy
+  digest (= 3.0.0)
   discourse-ember-rails (= 0.18.6)
   discourse-ember-source (~> 3.12.2)
   discourse-fonts
@@ -556,6 +573,9 @@ DEPENDENCIES
   mocha
   multi_json
   mustache
+  net-imap (~> 0.2.1)
+  net-pop (~> 0.1.1)
+  net-smtp (~> 0.2.1)
   nokogiri
   oj
   omniauth