Added ts-node as a dependency for the Snyk Github issues sync script

Signed-off-by: Harry Hogg <hhogg@spotify.com>

package.json

@@ -70,6 +70,7 @@
     "minimist": "^1.2.5",
     "prettier": "^2.2.1",
     "shx": "^0.3.2",
+    "ts-node": "^10.4.0",
     "yarn-lock-check": "^1.0.5"
   },
   "prettier": "@spotify/prettier-config",

yarn.lock

@@ -27465,7 +27465,7 @@ ts-node@^10.0.0:
     source-map-support "^0.5.17"
     yn "3.1.1"
 
-ts-node@^10.2.1:
+ts-node@^10.2.1, ts-node@^10.4.0:
   version "10.4.0"
   resolved "https://registry.npmjs.org/ts-node/-/ts-node-10.4.0.tgz#680f88945885f4e6cf450e7f0d6223dd404895f7"
   integrity sha512-g0FlPvvCXSIO1JDF6S232P5jPYqBkRL9qly81ZgAOSU7rwI0stphCgd2kLiCrU9DjQCrJMWEqcNSjQL02s6d8A==