chore(nextjs): Bump @sentry/webpack-plugin dependency to 1.17.3 (#4041)

This lets us take advantage of getsentry/sentry-webpack-plugin#316.

Author: lobsterkatie

packages/nextjs/package.json

@@ -23,7 +23,7 @@
     "@sentry/react": "6.13.3",
     "@sentry/tracing": "6.13.3",
     "@sentry/utils": "6.13.3",
-    "@sentry/webpack-plugin": "1.17.1",
+    "@sentry/webpack-plugin": "1.17.3",
     "tslib": "^1.9.3"
   },
   "devDependencies": {