Bump elliptic from 6.6.0 to 6.6.1 in /backstage

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.6.0 to 6.6.1.
- [Commits](indutny/elliptic@v6.6.0...v6.6.1)

---
updated-dependencies:
- dependency-name: elliptic
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

backstage/yarn.lock

@@ -14786,9 +14786,9 @@ electron-to-chromium@^1.4.668:
   integrity sha512-f9iZD1t3CLy1AS6vzM5EKGa6p9pRcOeEFXRFbaG2Ta+Oe7MkfRQ3fsvPYidzHe1h4i0JvIvpcY55C+B6BZNGtQ==
 
 elliptic@^6.5.3, elliptic@^6.5.5:
-  version "6.6.0"
-  resolved "https://registry.yarnpkg.com/elliptic/-/elliptic-6.6.0.tgz#5919ec723286c1edf28685aa89261d4761afa210"
-  integrity sha512-dpwoQcLc/2WLQvJvLRHKZ+f9FgOdjnq11rurqwekGQygGPsYSK29OMMD2WalatiqQ+XGFDglTNixpPfI+lpaAA==
+  version "6.6.1"
+  resolved "https://registry.yarnpkg.com/elliptic/-/elliptic-6.6.1.tgz#3b8ffb02670bf69e382c7f65bf524c97c5405c06"
+  integrity sha512-RaddvvMatK2LJHqFJ+YA4WysVN5Ita9E35botqIYspQ4TkRAlCicdzKOjlyv/1Za5RyTNn7di//eEV0uTAfe3g==
   dependencies:
     bn.js "^4.11.9"
     brorand "^1.1.0"