Bump axios from 1.4.0 to 1.5.0 in /backend

Bumps [axios](https://github.com/axios/axios) from 1.4.0 to 1.5.0.
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/v1.x/CHANGELOG.md)
- [Commits](https://github.com/axios/axios/compare/v1.4.0...v1.5.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

backend/package.json

@@ -41,7 +41,7 @@
     "@babel/core": "^7.21.3",
     "@mempool/electrum-client": "1.1.9",
     "@types/node": "^18.15.3",
-    "axios": "~1.4.0",
+    "axios": "~1.5.0",
     "bitcoinjs-lib": "~6.1.3",
     "crypto-js": "~4.1.1",
     "express": "~4.18.2",