Bump ubuntu from 20.04 to 22.04 in /tests/e2e/scripts (k3s-io#6686)

Bumps ubuntu from 20.04 to 22.04.

---
updated-dependencies:
- dependency-name: ubuntu
  dependency-type: direct:production
...

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

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

tests/e2e/scripts/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:20.04
+FROM ubuntu:22.04
 ARG EXTERNAL_ENCODED_VPN
 ARG VPN_ENCODED_LOGIN