chore: bump hardhat version to 2.22.6 (#5514)

# Description

## Problem\*

Resolves <!-- Link to GitHub Issue -->

## Summary\*

This PR bumps the version of hardhat we use for integration tests.

## Additional Context



## Documentation\*

Check one:
- [x] No documentation needed.
- [ ] Documentation included in this PR.
- [ ] **[For Experimental Features]** Documentation to be submitted in a
separate PR.

# PR Checklist\*

- [x] I have tested the changes locally.
- [x] I have formatted the changes with [Prettier](https://prettier.io/)
and/or `cargo fmt` on default settings.

compiler/integration-tests/package.json

@@ -25,7 +25,7 @@
         "eslint": "^8.57.0",
         "eslint-plugin-prettier": "^5.1.3",
         "ethers": "^6.7.1",
-        "hardhat": "^2.17.4",
+        "hardhat": "^2.22.6",
         "prettier": "3.2.5",
         "smol-toml": "^1.1.2",
         "toml": "^3.0.0",