Relax dependency specifications and build on node v20

I've removed the patch version from the version specifiers (i.e.
I'm now only specifying the major version for most deps), and
it now builds OK using node v20 on WSL.

webapp/package.json

@@ -13,33 +13,33 @@
     "lint:fix": "vue-cli-service lint --fix"
   },
   "dependencies": {
-    "imjoy-core": "^0.13.74",
+    "imjoy-core": "^0.13",
-    "material-design-icons": "^3.0.1",
+    "material-design-icons": "^3.0",
     "mousetrap": "^1.6.5",
-    "vue-observe-visibility": "^0.4.6"
+    "vue-observe-visibility": "^0.4"
   },
   "devDependencies": {
-    "@vue/cli-plugin-babel": "^3.12.1",
+    "@vue/cli-plugin-babel": "^3.12",
-    "@vue/cli-plugin-eslint": "^4.5.9",
+    "@vue/cli-plugin-eslint": "^4.5",
-    "@vue/cli-service": "^4.5.9",
+    "@vue/cli-service": "^4.5",
-    "@vue/eslint-config-prettier": "^6.0.0",
+    "@vue/eslint-config-prettier": "^6.0",
-    "axios": "^0.21.1",
+    "axios": "^0.21",
-    "babel-eslint": "^10.1.0",
+    "babel-eslint": "^10.1",
-    "css-loader": "^3.6.0",
+    "css-loader": "^3.6",
-    "eslint": "^6.8.0",
+    "eslint": "^6.8",
-    "eslint-plugin-prettier": "^3.2.0",
+    "eslint-plugin-prettier": "^3.4",
-    "eslint-plugin-vue": "^6.2.2",
+    "eslint-plugin-vue": "^6.2",
-    "less": "^3.12.2",
+    "less": "^3.13",
-    "less-loader": "^5.0.0",
+    "less-loader": "^5.0",
-    "mdns-js": "^1.0.3",
+    "mdns-js": "^1.0",
-    "prettier": "^1.19.1",
+    "prettier": "^1.19",
-    "uikit": "^3.5.10",
+    "uikit": "^3.17",
-    "vue": "^2.6.12",
+    "vue": "^2.7",
-    "vue-friendly-iframe": "^0.17.0",
+    "vue-friendly-iframe": "^0.17",
-    "vue-template-compiler": "^2.6.12",
+    "vue-template-compiler": "^2.7",
-    "vue-tour": "^1.5.0",
+    "vue-tour": "^1.6",
-    "vuejs-paginate": "^2.1.0",
+    "vuejs-paginate": "^2.1",
-    "vuex": "^3.6.0"
+    "vuex": "^3.6"
   },
   "postcss": {
     "plugins": {