Update E2E cache fixture with UTC timezone

Regenerated with TZ=UTC to match CI environment.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: ndbroadbent

tests/fixtures/cli/cache-fixture.tar.gz

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:ec81ffd0a2b1a6cfb19658f284ce0f18e6564696c7a9f0d31198ab3107c240a9
-size 13136028
+oid sha256:b71aaf97e07971a2e1a9e96789362b20422083c3c58e0aa6cd3e884394969f13
+size 14891940