Updated spellcheck action to contemporary version (#38)

Hello

As the maintainer of the [spellcheck GitHub
action](https://github.com/marketplace/actions/github-spellcheck-action)
I am sunsetting the used version as by the proposed [sunset
policy](https://github.com/rojopolis/spellcheck-github-actions/wiki#sunset-policy)

I just updated the action to the latest version, alternatively you can
alter the code to point to `v0` which is a canonical version. I do not
use this approach myself if I can avoid it, but it is widely used for
GitHub Actions.

Let me know if you have any issues with the proposed PR and I will do my
best to accommodate.

I can recommend [Dependabot](https://github.com/dependabot) for keeping
your GitHub actions up to date, alternatively there are
[Renovate](https://github.com/marketplace/renovate), if you want a PR
proposing a basic configuration for Dependabot, please let me know.

jonasbn

.github/workflows/spellchecker.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
       # The checkout step
       - uses: actions/checkout@master
-      - uses: rojopolis/spellcheck-github-actions@0.27.0
+      - uses: rojopolis/spellcheck-github-actions@0.44.0
         name: Spellcheck
         with:
           config_path: .pyspelling.yml