Removed membersAutoLogin GA labs flag

refs https://github.com/TryGhost/Team/issues/1258

- members auto login after Stripe checkout feature is GA so labs flag is no longer necessary
- bumps `@tryghost/members-api` to version that does not use the labs flag

core/shared/labs.js

@@ -15,7 +15,6 @@ const messages = {
 
 // flags in this list always return `true`, allows quick global enable prior to full flag removal
 const GA_FEATURES = [
-    'membersAutoLogin',
     'filesAPI',
     'fileCard',
     'headerCard'

package.json

@@ -79,7 +79,7 @@
     "@tryghost/limit-service": "1.0.8",
     "@tryghost/logging": "2.0.0",
     "@tryghost/magic-link": "1.0.14",
-    "@tryghost/members-api": "2.8.7",
+    "@tryghost/members-api": "2.8.8",
     "@tryghost/members-csv": "1.2.0",
     "@tryghost/members-importer": "0.3.5",
     "@tryghost/members-offers": "0.10.3",

yarn.lock

@@ -1586,10 +1586,10 @@
     "@tryghost/domain-events" "^0.1.3"
     "@tryghost/member-events" "^0.3.1"
 
-"@tryghost/members-api@2.8.7":
-  version "2.8.7"
-  resolved "https://registry.yarnpkg.com/@tryghost/members-api/-/members-api-2.8.7.tgz#0554bc9f6962b0c59b98cad9ec870f4fc0e9f109"
-  integrity sha512-BbF6FqjqyU0KA3oJeMQ6vZgtP1FfgIUpcd2BdQq7sNUtdM8T5CwcO8bCNoEztALnvMtKsJPn9oV2Pf7aVOsxOA==
+"@tryghost/members-api@2.8.8":
+  version "2.8.8"
+  resolved "https://registry.yarnpkg.com/@tryghost/members-api/-/members-api-2.8.8.tgz#f6695e45e824e40a73a91b2c6e4aaf3285e38228"
+  integrity sha512-CrP0bvVOVOxI8+cw/pas5kUUXutKvQElQPXQIpb2Ehd3Bfq+f2T3AiuWglla1oiNz+jSKZZFX5vMDw2XBbWd1g==
   dependencies:
     "@tryghost/debug" "^0.1.2"
     "@tryghost/domain-events" "^0.1.3"