[Snyk] Security upgrade axios from 1.7.2 to 1.13.5

[MManke188]

Snyk has created this PR to fix 1 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• backend/package.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Prototype Pollution SNYK-JS-AXIOS-15252993	828

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Pull request overview

Updates the backend’s axios dependency to a patched version to remediate a reported prototype pollution vulnerability.

Changes:

• Bump axios from 1.7.2 to 1.13.5 in backend/package.json.

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backend/package-lock.json still pins axios to 1.7.2, so updating only package.json won't update installs done via npm ci (and may leave the vulnerability unfixed / cause CI to fail due to lockfile mismatch). Please regenerate and commit the lockfile update for axios 1.13.5 (or otherwise align the repo’s lockfile strategy).