Update dependency mailgun.js to v10.3.0 (#21949)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [mailgun.js](https://redirect.github.com/mailgun/mailgun.js) |
[`10.2.4` ->
`10.3.0`](https://renovatebot.com/diffs/npm/mailgun.js/10.2.4/10.3.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/mailgun.js/10.3.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/mailgun.js/10.3.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/mailgun.js/10.2.4/10.3.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/mailgun.js/10.2.4/10.3.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>mailgun/mailgun.js (mailgun.js)</summary>

###
[`v10.3.0`](https://redirect.github.com/mailgun/mailgun.js/blob/HEAD/CHANGELOG.md#1030-2024-12-23)

[Compare
Source](https://redirect.github.com/mailgun/mailgun.js/compare/v10.2.4...v10.3.0)

##### Features

- Add support for Inbox Placements
([5450a4b](5450a4b37c))

#####
[10.2.4](https://redirect.github.com/mailgun/mailgun.js/compare/v10.2.3...v10.2.4)
(2024-11-21)

##### Bug Fixes

- **deps-dev:** bump webpack from 5.76.0 to 5.94.0
([166f27c](166f27ca06))
- **deps:** bump axios from 1.7.2 to 1.7.4
([22ae183](22ae18375e))
- Fix vulnarable dependency
([039866b](039866bc05))

##### Other changes

- Add tests coverage thresholds
([bfca371](bfca3710da))

#####
[10.2.3](https://redirect.github.com/mailgun/mailgun.js/compare/v10.2.2...v10.2.3)
(2024-07-18)

#####
[10.2.2](https://redirect.github.com/mailgun/mailgun.js/compare/v10.2.1...v10.2.2)
(2024-07-17)

##### Bug Fixes

- Update dependencies
([0d810fb](0d810fb40d))

#####
[10.2.1](https://redirect.github.com/mailgun/mailgun.js/compare/v10.2.0...v10.2.1)
(2024-02-16)

##### Bug Fixes

- Source.on is not a function for t:variables
([e647143](e64714326b))

</details>

---

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🔕 **Ignore**: Close this PR and you won't be reminded about this update
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---

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---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
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ghost/mailgun-client/package.json

@@ -29,6 +29,6 @@
     "@tryghost/metrics": "1.0.34",
     "form-data": "4.0.0",
     "lodash": "4.17.21",
-    "mailgun.js": "10.2.4"
+    "mailgun.js": "10.3.0"
   }
 }

yarn.lock

@@ -22812,10 +22812,10 @@ magic-string@^0.30.0, magic-string@^0.30.1:
   dependencies:
     "@jridgewell/sourcemap-codec" "^1.4.15"
 
-mailgun.js@10.2.4:
-  version "10.2.4"
-  resolved "https://registry.yarnpkg.com/mailgun.js/-/mailgun.js-10.2.4.tgz#e3e2a689a3be4c177b3612fabc4871c34c7d76f4"
-  integrity sha512-l1Nth1YWGrUdRIahxsUIzVGoP7waLctS0MKFpd1QPzE8NEZqZ1PafYgw+c4ThombwJFyhF18SN1htOE78Kfv+w==
+mailgun.js@10.3.0:
+  version "10.3.0"
+  resolved "https://registry.yarnpkg.com/mailgun.js/-/mailgun.js-10.3.0.tgz#7599600a4c144e4df63675ede48de8fe9b38dbfc"
+  integrity sha512-HJPmninRDGlzs8izNyfM/hbvefz6ol1gqeZ+doiumEHli7kGCrLlK6hURsq6oLjDoTNwgS37CUDhBPQy7x5PeQ==
   dependencies:
     axios "^1.7.4"
     base-64 "^1.0.0"