chore(deps): bump undici from 5.4.0 to 5.5.1 in /packages/backend (#8842)

Bumps [undici](https://github.com/nodejs/undici) from 5.4.0 to 5.5.1.
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](https://github.com/nodejs/undici/compare/v5.4.0...v5.5.1)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

packages/backend/yarn.lock

@@ -6827,9 +6827,9 @@ unbox-primitive@^1.0.1:
     which-boxed-primitive "^1.0.2"
 
 undici@^5.2.0:
-  version "5.4.0"
-  resolved "https://registry.yarnpkg.com/undici/-/undici-5.4.0.tgz#c474fae02743d4788b96118d46008a24195024d2"
-  integrity sha512-A1SRXysDg7J+mVP46jF+9cKANw0kptqSFZ8tGyL+HBiv0K1spjxPX8Z4EGu+Eu6pjClJUBdnUPlxrOafR668/g==
+  version "5.5.1"
+  resolved "https://registry.yarnpkg.com/undici/-/undici-5.5.1.tgz#baaf25844a99eaa0b22e1ef8d205bffe587c8f43"
+  integrity sha512-MEvryPLf18HvlCbLSzCW0U00IMftKGI5udnjrQbC5D4P0Hodwffhv+iGfWuJwg16Y/TK11ZFK8i+BPVW2z/eAw==
 
 unique-filename@^1.1.1:
   version "1.1.1"