do not use relative volta config for published packages

cli/package.json

@@ -127,6 +127,7 @@
   },
   "types": "lib/index.d.ts",
   "volta": {
-    "extends": "../package.json"
+    "node": "12.18.2",
+    "yarn": "1.22.4"
   }
 }

content-directory-schemas/package.json

@@ -46,6 +46,7 @@
   },
   "homepage": "https://github.com/Joystream/joystream",
   "volta": {
-    "extends": "../package.json"
+    "node": "12.18.2",
+    "yarn": "1.22.4"
   }
 }

types/package.json

@@ -61,6 +61,7 @@
   },
   "homepage": "https://github.com/Joystream/joystream",
   "volta": {
-    "extends": "../package.json"
+    "node": "12.18.2",
+    "yarn": "1.22.4"
   }
 }