Bumping pxt-core to 11.4.43 (#6437)

Author: abchatra

package.json

@@ -46,7 +46,7 @@
     },
     "dependencies": {
         "pxt-common-packages": "12.3.31",
-        "pxt-core": "11.4.42"
+        "pxt-core": "11.4.43"
     },
     "overrides": {
         "@blockly/plugin-workspace-search": {