chore(payments-plugin): Pin mollie client version to minor

v3.6 breaks e2e tests for some reason. Needs investigation.

packages/payments-plugin/package.json

@@ -26,7 +26,7 @@
         "stripe": "8.x"
     },
     "devDependencies": {
-        "@mollie/api-client": "^3.5.1",
+        "@mollie/api-client": "~3.5.1",
         "@types/braintree": "^2.22.15",
         "@vendure/common": "^1.4.7",
         "@vendure/core": "^1.4.7",