test workflow: Fix cache reference in egg-info step
The step erroneously references `postgres-cache` instead of
`venv-cache`.
@@ -243,7 +243,7 @@ jobs:
- name: Install edgedb-server and populate egg-info
env:
- CACHE_HIT: ${{ steps.postgres-cache.outputs.cache-hit }}
+ CACHE_HIT: ${{ steps.venv-cache.outputs.cache-hit }}
BUILD_EXT_MODE: skip
run: |
if [[ "$CACHE_HIT" == "true" ]]; then
