ci: Do not use hashes when pip-installing

docker/gl-testing/Dockerfile

@@ -72,9 +72,14 @@ WORKDIR repo
 # We filter out all path-depenendencies from this list cause we
 # don't have the code in the Docker-repo yet.
 RUN poetry lock
-RUN poetry export -f requirements.txt -o requirements.txt --with=dev
-RUN cat requirements.txt | sed '/file:\/\/\//d' > requirements2.txt
-RUN python -m pip install --upgrade pip && pip install wheel && pip install -r requirements2.txt
+RUN poetry export \
+    -f requirements.txt \
+    -o requirements.txt \
+    --without-hashes \
+    --with=dev
+RUN python -m pip install --upgrade pip && \
+    pip install wheel && \
+    pip install -r requirements.txt
 
 # Later we will run this image under another user
 # It is great if they can access this as well