chore: bump up ava version to v7 (#14563)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [ava](https://avajs.dev)
([source](https://redirect.github.com/avajs/ava)) | [`^6.4.1` →
`^7.0.0`](https://renovatebot.com/diffs/npm/ava/6.4.1/7.0.0) |
![age](https://developer.mend.io/api/mc/badges/age/npm/ava/7.0.0?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/ava/6.4.1/7.0.0?slim=true)
|
| [ava](https://avajs.dev)
([source](https://redirect.github.com/avajs/ava)) | [`^6.4.0` →
`^7.0.0`](https://renovatebot.com/diffs/npm/ava/6.4.1/7.0.0) |
![age](https://developer.mend.io/api/mc/badges/age/npm/ava/7.0.0?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/ava/6.4.1/7.0.0?slim=true)
|

---

### Release Notes

<details>
<summary>avajs/ava (ava)</summary>

###
[`v7.0.0`](https://redirect.github.com/avajs/ava/releases/tag/v7.0.0)

[Compare
Source](https://redirect.github.com/avajs/ava/compare/v6.4.1...v7.0.0)

##### What's Changed

- Replace `strip-ansi` with `node:util.stripVTControlCharacters` by
[@&#8203;fisker](https://redirect.github.com/fisker) in
[#&#8203;3403](https://redirect.github.com/avajs/ava/pull/3403)
- Remove support for Node.js 18 and 23; require 20.19 or newer, 22.20 or
newer or 24,12 or newer; update dependencies including transitive `glob`
by [@&#8203;novemberborn](https://redirect.github.com/novemberborn) in
[#&#8203;3416](https://redirect.github.com/avajs/ava/pull/3416)

**Full Changelog**:
<https://github.com/avajs/ava/compare/v6.4.1...v7.0.0>

</details>

---

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packages/backend/server/package.json

@@ -138,7 +138,7 @@
     "@types/semver": "^7.5.8",
     "@types/sinon": "^21.0.0",
     "@types/supertest": "^7.0.0",
-    "ava": "^6.4.0",
+    "ava": "^7.0.0",
     "c8": "^10.1.3",
     "nodemon": "^3.1.14",
     "react-email": "^4.3.2",