revert: integrate swagger-client@3.19.0-beta.7 (#8426)

swagger-client has been reverted back to ^3.18.5,
because it introduces backward incompatible behavior
for yarn@2 package manager.

Refs 61642927b6
Refs d293555a8f
Refs #8418

package.json

@@ -94,7 +94,7 @@
     "reselect": "^4.1.5",
     "serialize-error": "^8.1.0",
     "sha.js": "^2.4.11",
-    "swagger-client": "=3.19.0-beta.7",
+    "swagger-client": "^3.18.5",
     "url-parse": "^1.5.8",
     "xml": "=1.0.1",
     "xml-but-prettier": "^1.0.1",