feat: require container-interop ^1.2

We now require ^1.2 to ensure that PSR-11 interfaces are also present,
allowing new classes to typehint only on the PSR-11 interfaces. This
will allow compatibility to continue as the 1.2 variants extend the
PSR-11 interfaces.

Author: weierophinney

composer.json

@@ -38,7 +38,7 @@
         "phpbench/phpbench": "^0.13",
         "phpunit/phpunit": "^5.7.27 || ^6.5.8 || ^7.1.2",
         "zendframework/zend-stdlib": "^2.7.3 || ^3.0",
-        "container-interop/container-interop": "^1.1.0",
+        "container-interop/container-interop": "^1.2.0",
         "zendframework/zend-coding-standard": "~1.0.0"
     },
     "suggest": {