chore(python-runtime): remove pinned version of libexpat (#3844)

Signed-off-by: odubajDT <[email protected]>
Signed-off-by: odubajDT <[email protected]>
Co-authored-by: Moritz Wiesinger <[email protected]>

Author: odubajDT

runtimes/python-runtime/Dockerfile

@@ -6,7 +6,7 @@ LABEL org.opencontainers.image.source="https://github.com/keptn/lifecycle-toolki
     org.opencontainers.image.vendor="Keptn" \
     org.opencontainers.image.licenses="Apache-2.0"
 
-RUN apk --no-cache add curl libexpat==2.6.3-r0
+RUN apk --no-cache add curl
 
 RUN pip install -q --disable-pip-version-check pyyaml GitPython requests