ci: bugfix binderhub image not updating on change

Chartpress 1.0.0 contained a regression, and our publishing pipeline was
using chartpress 1.0.0 instead of 0.7.0, so it was affected. This made
the image version used by binderhub since chartpress 1.0.0 was released
in 21 Nov 2020 be the same version as the image-cleaner image.

The only PR that was influenced by this mishap was a PR merged ~2 hours.
With this commit, it should not happen again.

.github/workflows/publish.yml

@@ -40,7 +40,7 @@ jobs:
         run: |
           . ./ci/common
           setup_helm v3.4.1
-          pip install --no-cache-dir chartpress
+          pip install --no-cache-dir chartpress==1.0.*
 
       - name: Setup push rights to jupyterhub/helm-chart
         # This was setup by...

dev-requirements.txt

@@ -1,5 +1,5 @@
 beautifulsoup4
-chartpress==0.7.*
+chartpress==1.0.*
 click
 codecov
 html5lib