fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/npm:sshpk:20180409

package.json

@@ -84,7 +84,7 @@
         "trezor-connect": "7.0.2",
         "trezor-ui-components": "^1.0.0-beta.20",
         "wallet-address-validator": "^0.2.4",
-        "web3": "1.0.0-beta.35",
+        "web3": "1.2.0",
         "webpack": "^4.29.3",
         "webpack-build-notifier": "^0.1.30",
         "webpack-bundle-analyzer": "^3.0.3",