Bump virtualenv from 20.17.1 to 20.34.0

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.17.1 to 20.34.0.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@20.17.1...20.34.0)

---
updated-dependencies:
- dependency-name: virtualenv
  dependency-version: 20.34.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

backend/requirements.txt

@@ -239,6 +239,6 @@ typing-extensions==4.4.0 ; python_version >= "3.8" and python_version < "4.0" \
 uvicorn==0.18.3 ; python_version >= "3.8" and python_version < "4.0" \
     --hash=sha256:0abd429ebb41e604ed8d2be6c60530de3408f250e8d2d84967d85ba9e86fe3af \
     --hash=sha256:9a66e7c42a2a95222f76ec24a4b754c158261c4696e683b9dadc72b590e0311b
-virtualenv==20.17.1 ; python_version >= "3.8" and python_version < "4.0" \
-    --hash=sha256:ce3b1684d6e1a20a3e5ed36795a97dfc6af29bc3970ca8dab93e11ac6094b3c4 \
-    --hash=sha256:f8b927684efc6f1cc206c9db297a570ab9ad0e51c16fa9e45487d36d1905c058
+virtualenv==20.34.0 ; python_version >= "3.8" and python_version < "4.0" \
+    --hash=sha256:341f5afa7eee943e4984a9207c025feedd768baff6753cd660c857ceb3e36026 \
+    --hash=sha256:44815b2c9dee7ed86e387b842a84f20b93f7f417f95886ca1996a72a4138eb1a