renovatebot(deps): update dependency com.squareup.retrofit2:retrofit to v2.6.0 (#4015)
renovatebot(deps): update dependency com.squareup.retrofit2:retrofit to v2.6.0 (#4015)


apereo/cas,philliprower/cas,rkorn86/cas,apereo/cas,apereo/cas,pdrados/cas,leleuj/cas,leleuj/cas,leleuj/cas,fogbeam/cas_mirror,pdrados/cas,philliprower/cas,fogbeam/cas_mirror,rkorn86/cas,Jasig/cas,Jasig/cas,leleuj/cas,pdrados/cas,philliprower/cas,rkorn86/cas,philliprower/cas,rkorn86/cas,leleuj/cas,Jasig/cas,apereo/cas,pdrados/cas,apereo/cas,fogbeam/cas_mirror,Jasig/cas,philliprower/cas,fogbeam/cas_mirror,pdrados/cas,philliprower/cas,fogbeam/cas_mirror,apereo/cas,philliprower/cas,leleuj/cas,apereo/cas,fogbeam/cas_mirror,pdrados/cas