BAU: Bump @otplib/core from 12.0.1 to 13.4.0

Bumps [@otplib/core](https://github.com/yeojz/otplib/tree/HEAD/packages/core) from 12.0.1 to 13.4.0.
- [Release notes](https://github.com/yeojz/otplib/releases)
- [Commits](https://github.com/yeojz/otplib/commits/v13.4.0/packages/core)

---
updated-dependencies:
- dependency-name: "@otplib/core"
  dependency-version: 13.4.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package-lock.json

@@ -74,7 +74,7 @@
     "@govuk-one-login/frontend-passthrough-headers": "1.3.2",
     "@govuk-one-login/frontend-vital-signs": "0.1.4",
     "@govuk-one-login/spinner": "1.1.1",
-    "@otplib/core": "12.0.1",
+    "@otplib/core": "13.4.0",
     "@otplib/plugin-base32-enc-dec": "12.0.1",
     "@simplewebauthn/browser": "13.3.0",
     "axios": "1.15.0",