Pin reverse dependency tests to 1.5

Author: oxinabox

.github/workflows/IntegrationTest.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        julia-version: [1]
+        julia-version: [1.5]
         os: [ubuntu-latest]
         package:
           - {user: JuliaDiff, repo: ChainRules.jl}