Upgrade xblock-lti-consumer.

EDUCATOR-945

requirements/edx/github.txt

@@ -86,7 +86,7 @@ git+https://github.com/edx/edx-milestones.git@v0.1.11#egg=edx-milestones==0.1.11
 git+https://github.com/edx/xblock-utils.git@v1.0.5#egg=xblock-utils==1.0.5
 -e git+https://github.com/edx-solutions/xblock-google-drive.git@138e6fa0bf3a2013e904a085b9fed77dab7f3f21#egg=xblock-google-drive
 git+https://github.com/edx/edx-user-state-client.git@1.0.1#egg=edx-user-state-client==1.0.1
-git+https://github.com/edx/xblock-lti-consumer.git@v1.1.4#egg=lti_consumer-xblock==1.1.4
+git+https://github.com/edx/xblock-lti-consumer.git@v1.1.5#egg=lti_consumer-xblock==1.1.5
 git+https://github.com/edx/edx-proctoring.git@0.18.2#egg=edx-proctoring==0.18.2
 
 # Third Party XBlocks