Bug 1608136 - Fixed ContentfulSpeedIndex extraction r=sparky

The convert output is now parsed in a more robust manner.

Differential Revision: https://phabricator.services.mozilla.com/D60108

--HG--
extra : moz-landing-system : lando

tools/browsertime/package-lock.json

@@ -4,8 +4,8 @@
   "lockfileVersion": 1,
   "dependencies": {
     "browsertime": {
-      "version": "https://github.com/mozilla/browsertime/tarball/e37e3b0bfe2daa4dc0a099c640e557847c949abd",
-      "integrity": "sha512-e9vlCADsslXsc7A/UCG9skIbHnrsq6scu3CrQG/CuRdo2J6MijD8+DXFaOWI2wJMBr/DIV6wAKpeU+e8whVrEg==",
+      "version": "https://github.com/mozilla/browsertime/tarball/e7286db6dd5fea832860f15c1782be288771f134",
+      "integrity": "sha512-jDafDyhKwGk15uFkQkV+dOE6QxqeuEMPVbN0y8+Bv7y293Bv+3Hj1Ga/KgiJvjLzCGgwFVzdBVw+85M18unvvw==",
       "dev": true,
       "requires": {
         "@cypress/xvfb": "1.2.4",

tools/browsertime/package.json

@@ -5,7 +5,7 @@
   "license": "MPL-2.0",
   "dependencies": {},
   "devDependencies": {
-    "browsertime": "https://github.com/mozilla/browsertime/tarball/e37e3b0bfe2daa4dc0a099c640e557847c949abd"
+    "browsertime": "https://github.com/mozilla/browsertime/tarball/e7286db6dd5fea832860f15c1782be288771f134"
   },
   "notes(private)": "We don't want to publish to npm, so this is marked as private",
   "private": true