fix: make ``shyaml`` installation work again

Dockerfile

@@ -56,6 +56,8 @@ RUN apk --update add binutils && \
 ## install shyaml
 RUN apk add python-dev build-base
 RUN apk add yaml-dev cython cython-dev && \
+    pip install "cython<3.0.0" wheel && \
+    pip install pyyaml==5.4.1 --no-build-isolation && \
     pip install shyaml
 
 RUN pip install crudini