Use lts-11.5 for 8.2 job

This is same GHC version, but newer other packages, which we need after
updating for yesod-1.6. The 11.5 yaml is equivalent to stack.yaml, but
we'll keep it distinct for when we update our default development
resolver.

.circleci/config.yml

@@ -51,7 +51,7 @@ jobs:
   build_8.2.2:
     <<: *stack_build
     environment:
-      STACK_ARGUMENTS: --stack-yaml stack-lts-10.3.yaml
+      STACK_ARGUMENTS: --stack-yaml stack-lts-11.5.yaml
   build:
     <<: *stack_build
   build_nightly:

stack-lts-10.3.yaml

@@ -1,6 +0,0 @@
----
-resolver: lts-10.3
-extra-deps:
-  - http-types-0.12.1
-  - yesod-auth-1.6.3
-  - yesod-core-1.6.3

stack-lts-11.5.yaml

@@ -0,0 +1,4 @@
+---
+resolver: lts-11.5
+extra-deps:
+  - hoauth2-1.7.1