feat: bump python & golang plugins

python: more robust implementation, not relying on pip's internal code:
  snyk/snyk-python-plugin#49
go: better symlinks support:  snyk/snyk-go-plugin#31

package.json

@@ -59,15 +59,15 @@
     "semver": "^5.5.0",
     "snyk-config": "2.2.0",
     "snyk-docker-plugin": "1.12.0",
-    "snyk-go-plugin": "1.5.2",
+    "snyk-go-plugin": "1.6.0",
     "snyk-gradle-plugin": "2.1.0",
     "snyk-module": "1.8.2",
     "snyk-mvn-plugin": "2.0.0",
     "snyk-nodejs-lockfile-parser": "1.5.3",
     "snyk-nuget-plugin": "1.6.5",
     "snyk-php-plugin": "1.5.1",
     "snyk-policy": "1.12.0",
-    "snyk-python-plugin": "1.8.2",
+    "snyk-python-plugin": "1.9.0",
     "snyk-resolve": "1.0.1",
     "snyk-resolve-deps": "4.0.2",
     "snyk-sbt-plugin": "2.0.0",