chore(deps): update dependency hardhat to v2.22.15 (#65)

This PR contains the following updates:

| Package | Type | Update | Change | OpenSSF |
|---|---|---|---|---|
| [hardhat](https://hardhat.org)
([source](https://redirect.github.com/nomiclabs/hardhat)) | dependencies
| patch | [`2.22.14` ->
`2.22.15`](https://renovatebot.com/diffs/npm/hardhat/2.22.14/2.22.15) |
[![OpenSSF
Scorecard](https://api.securityscorecards.dev/projects/github.com/nomiclabs/hardhat/badge)](https://securityscorecards.dev/viewer/?uri=github.com/nomiclabs/hardhat)
|

---

### Release Notes

<details>
<summary>nomiclabs/hardhat (hardhat)</summary>

###
[`v2.22.15`](https://redirect.github.com/NomicFoundation/hardhat/releases/tag/hardhat%402.22.15):
Hardhat v2.22.15

[Compare
Source](https://redirect.github.com/nomiclabs/hardhat/compare/[email protected]@2.22.15)

This is a small bug fix release to fix custom HTTP headers when used in
forked configurations.

#### Changes

-
[`ede1cde`](https://redirect.github.com/nomiclabs/hardhat/commit/ede1cde):
Fixed custom HTTP headers for forked configurations

***

> 💡 **The Nomic Foundation is hiring! Check [our open
positions](https://www.nomic.foundation/jobs).**

***

</details>

---

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package.json

@@ -43,7 +43,7 @@
     "@nomiclabs/hardhat-solhint": "4.0.1",
     "@openzeppelin/contracts": "5.1.0",
     "@openzeppelin/subgraphs": "0.1.8-5",
-    "hardhat": "2.22.14",
+    "hardhat": "2.22.15",
     "solhint": "5.0.3",
     "@prb/math": "4.1.0"
   },