ci: bump bats: 1.5 -> 1.10

on my machine I saw a

  FileNotFoundError: [Errno 2] No such file or directory: 'stargazers-rs.csv.tmp' -> 'stargazers-rs.csv'

during test 1 that I had not seen years ago
and that's also not present in GitHub actions.
I supposed that something about my tmp directory
setup and bats specific way to manage directories
was the culprit. Bumping bats indeed helped.

Bats has made great progress, that's lovely to see.

ci.Dockerfile

@@ -10,7 +10,7 @@ RUN pip install -r requirements-ci.txt
 # Install bats for running cmdline tests. This is the image used when invoking
 # `make bats-test`.
 RUN git clone https://github.com/bats-core/bats-core.git && cd bats-core && \
-    git checkout v1.5.0 && ./install.sh /usr/local
+    git checkout v1.10.0 && ./install.sh /usr/local
 
 RUN mkdir -p /bats-libraries
 RUN git clone https://github.com/bats-core/bats-support /bats-libraries/bats-support