CI: set fail-fast to False (#553)

With `fail-fast` set to True (the default), all running jobs in the matrix are cancelled as soon as a single one fails. This makes it hard to see exactly which Python versions a PR is failing on, if there are failures, because the CI just becomes a sea of red, even if the PR is only failing on a single Python version.

Author: AlexWaygood

.github/workflows/ci.yml

@@ -12,8 +12,9 @@ jobs:
     runs-on: ubuntu-latest
 
     strategy:
+      fail-fast: false
       matrix:
-        # TODO add 3.12.0-dev when
+        # TODO add 3.12-dev when
         # aiohttp, frozenlist and yarl support alpha 5+
         # https://github.com/python/blurb_it/pull/330#issuecomment-1449496275
         # https://github.com/python/bedevere/pull/547#issuecomment-1529153851