fix: package.json & yarn.lock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-PROTOBUFJS-5756498
- https://snyk.io/vuln/SNYK-JS-ELLIPTIC-7577916
- https://snyk.io/vuln/SNYK-JS-ELLIPTIC-7577917
- https://snyk.io/vuln/SNYK-JS-ELLIPTIC-7577918

package.json

@@ -32,8 +32,8 @@
   "dependencies": {
     "@cosmjs/launchpad": "0.27.0",
     "@cosmjs/proto-signing": "0.27.0",
-    "@cosmjs/stargate": "0.27.0",
-    "@keplr-wallet/types": "^0.11.3",
+    "@cosmjs/stargate": "0.28.6",
+    "@keplr-wallet/types": "^0.11.32",
     "axios": "0.21.1",
     "buffer": "^6.0.3",
     "events": "^3.3.0",