Updating npm dependencies and getting the build to work (#1001)

* Updating npm dependencies and getting the build to work

* update node in github actions to 14.x

.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