Update to latest Strophe commit with explicit bind support

package.json

@@ -82,7 +82,7 @@
     "jasmine-core": "2.99.1",
     "jed": "1.1.1",
     "jsdoc": "^3.5.5",
-    "lerna": "^3.14.0",
+    "lerna": "^3.14.1",
     "lodash-template-webpack-loader": "jcbrand/lodash-template-webpack-loader",
     "long": "^3.1.0",
     "mini-css-extract-plugin": "^0.5.0",

src/headless/package.json

@@ -29,7 +29,7 @@
     "jed": "1.1.1",
     "lodash": "^4.17.11",
     "pluggable.js": "2.0.1",
-    "strophe.js": "strophe/strophejs#f52f26e8cc23f738b7b39180a7ee4511ccd41526",
+    "strophe.js": "strophe/strophejs#bc8a6b62203a17ada6bd78945c993c6f7dccd1de",
     "twemoji": "^11.0.1",
     "urijs": "^1.19.1"
   }