try removing pkg-config

Author: carlcsaposs-canonical

spread.yaml

@@ -101,10 +101,10 @@ backends:
           username: ubuntu
           environment:
             # Several python packages (e.g. cryptography, bcrypt) do not have s390x builds on PyPI,
-            # so they must be built from source. `pkg-config` and rust toolchain needed
+            # so they must be built from source. Rust toolchain needed
             # (These packages are being built when installing poetry or integration test Python
             # dependencies)
-            CONCIERGE_EXTRA_DEBS: pipx,pkg-config,rustup
+            CONCIERGE_EXTRA_DEBS: pipx,rustup
           # TODO add renovate comment for rust version
           prepare: |
             rustup set profile minimal