Bump ethers from 5.3.1 to 5.5.3 in /examples/eth-pm-wallet-encryption (#456)

Bumps [ethers](https://github.com/ethers-io/ethers.js/tree/HEAD/packages/ethers) from 5.3.1 to 5.5.3.
- [Release notes](https://github.com/ethers-io/ethers.js/releases)
- [Changelog](https://github.com/ethers-io/ethers.js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ethers-io/ethers.js/commits/v5.5.3/packages/ethers)

---
updated-dependencies:
- dependency-name: ethers
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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examples/eth-pm-wallet-encryption/package.json

@@ -13,7 +13,7 @@
     "@types/react": "^17.0.38",
     "@types/react-dom": "^17.0.11",
     "eth-sig-util": "^3.0.1",
-    "ethers": "^5.2.0",
+    "ethers": "^5.5.3",
     "fontsource-roboto": "^4.0.0",
     "js-waku": "../../build/main",
     "protobufjs": "^6.11.2",