Do not upgrade async module since api has changed

We have to first fix for example doWhilst() usage

package-lock.json

@@ -319,9 +319,12 @@
       "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU="
     },
     "async": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/async/-/async-3.1.1.tgz",
-      "integrity": "sha512-X5Dj8hK1pJNC2Wzo2Rcp9FBVdJMGRR/S7V+lH46s8GVFhtbo5O4Le5GECCF/8PISVdkUA6mMPvgz7qTTD1rf1g=="
+      "version": "2.6.3",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.3.tgz",
+      "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
+      "requires": {
+        "lodash": "^4.17.14"
+      }
     },
     "async-foreach": {
       "version": "0.1.3",
@@ -1337,6 +1340,11 @@
         "optimist": "^0.6.1"
       },
       "dependencies": {
+        "async": {
+          "version": "3.1.1",
+          "resolved": "https://registry.npmjs.org/async/-/async-3.1.1.tgz",
+          "integrity": "sha512-X5Dj8hK1pJNC2Wzo2Rcp9FBVdJMGRR/S7V+lH46s8GVFhtbo5O4Le5GECCF/8PISVdkUA6mMPvgz7qTTD1rf1g=="
+        },
         "ejs": {
           "version": "2.7.4",
           "resolved": "https://registry.npmjs.org/ejs/-/ejs-2.7.4.tgz",

package.json

@@ -17,7 +17,7 @@
     "@google-cloud/dns": "^1.2.8",
     "@google-cloud/storage": "^4.3.0",
     "@sindresorhus/df": "git+https://github.com/cloudron-io/df.git#type",
-    "async": "^3.1.1",
+    "async": "^2.6.3",
     "aws-sdk": "^2.610.0",
     "body-parser": "^1.19.0",
     "cloudron-manifestformat": "^4.0.0",