Bump ims-lti from 1.2.8 to 1.2.9

Bumps [ims-lti](https://github.com/instructure/ims-lti) from 1.2.8 to 1.2.9.
- [Release notes](https://github.com/instructure/ims-lti/releases)
- [Commits](https://github.com/instructure/ims-lti/commits)

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

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

Gemfile.lock

@@ -178,9 +178,9 @@ GEM
     image_processing (1.12.2)
       mini_magick (>= 4.9.5, < 5)
       ruby-vips (>= 2.0.17, < 3)
-    ims-lti (1.2.8)
+    ims-lti (1.2.9)
       builder (>= 1.0, < 4.0)
-      oauth (>= 0.4.5, < 0.6)
+      oauth (>= 0.4.5)
       rexml
     influxdb (0.8.1)
     jbuilder (2.11.5)
@@ -257,7 +257,9 @@ GEM
       racc (~> 1.4)
     nyan-cat-formatter (0.12.0)
       rspec (>= 2.99, >= 2.14.2, < 4)
-    oauth (0.5.14)
+    oauth (0.6.2)
+      snaky_hash (~> 2.0)
+      version_gem (~> 1.1)
     oauth2 (2.0.9)
       faraday (>= 0.17.3, < 3.0)
       jwt (>= 1.0, < 3.0)