Bump handlebars from 4.7.6 to 4.7.7

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.7.6 to 4.7.7.
- [Release notes](https://github.com/wycats/handlebars.js/releases)
- [Changelog](https://github.com/handlebars-lang/handlebars.js/blob/master/release-notes.md)
- [Commits](handlebars-lang/handlebars.js@v4.7.6...v4.7.7)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

ljswitchboard-builder/package.json

@@ -22,7 +22,7 @@
 		"extract-zip": "1.7.0",
 		"fs-extra": "0.18.4",
 		"fs.extra": "1.3.2",
-		"handlebars": "4.7.6",
+		"handlebars": "4.7.7",
 		"jszip": "2.5.0",
 		"node-zip": "1.1.1",
 		"q": "1.5.1",

ljswitchboard-io_manager/package.json

@@ -38,7 +38,7 @@
     "comment-json": "2.x.x",
     "dict": "1.4.0",
     "ffi": "2.3.0",
-    "handlebars": "4.7.6",
+    "handlebars": "4.7.7",
     "json-parser": "^3.1.2",
     "labjack-nodejs": "*",
     "ljm-ffi": "*",

ljswitchboard-module_manager/package-lock.json

@@ -24,7 +24,7 @@
   "license": "MIT",
   "dependencies": {
     "sprintf-js": "1.1.2",
-    "handlebars": "4.7.6"
+    "handlebars": "4.7.7"
   },
   "bugs": {
     "url": "https://github.com/labjack/labjack_kipling/issues"
@@ -37,7 +37,7 @@
     "jshint": "2.10.2",
     "html5-lint": "0.3.0",
     "rewire": "4.0.1",
-    "handlebars": "4.7.6",
+    "handlebars": "4.7.7",
     "mocha": "7.2.0",
     "chai": "^4.2.0"
   },