Updating npm dependencies (#4380)

* Updating npm dependencies

* Also update node version

.github/workflows/pxt-buildmain.yml

@@ -14,7 +14,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [8.x]
+        node-version: [14.x]
 
     steps:
       - uses: actions/checkout@v1

.github/workflows/pxt-buildpr.yml

@@ -9,7 +9,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [8.x]
+        node-version: [14.x]
 
     steps:
       - uses: actions/checkout@v1

.github/workflows/pxt-buildpush.yml

@@ -14,7 +14,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [8.x]
+        node-version: [14.x]
 
     steps:
       - uses: actions/checkout@v1

package.json

@@ -37,14 +37,14 @@
         "@types/react": "16.4.7",
         "@types/react-dom": "16.0.3",
         "@types/web-bluetooth": "0.0.4",
-        "less": "2.7.3",
+        "less": "3.13.1",
         "react": "16.8.3",
         "react-dom": "16.11.0",
-        "semantic-ui-less": "2.2.14",
+        "semantic-ui-less": "2.4.1",
         "typescript": "4.2.3"
     },
     "dependencies": {
-        "pxt-common-packages": "9.0.1",
-        "pxt-core": "7.1.4"
+        "pxt-common-packages": "9.2.7",
+        "pxt-core": "7.2.16"
     }
 }

theme/theme.config

@@ -17,6 +17,8 @@
    specify theme name below
 */
 
+@placeholder: 'default';
+
 /* Global */
 @site       : 'pxt';
 @reset      : 'default';
@@ -87,7 +89,7 @@
          Import Theme
 *******************************/
 
-@import "theme.less";
+@import (multiple) "theme.less";
 
 @fontPath  : 'fonts';