Bump python from 3.9.7-slim to 3.10.0-slim (#64)

Bumps python from 3.9.7-slim to 3.10.0-slim.

---
updated-dependencies:
- dependency-name: python
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Dockerfile

@@ -2,7 +2,7 @@
 ARG SPELLCHECK_LANGS="en,de"
 
 # Builder stage: configure env vars, labels, add plain files, install common packages
-FROM python:3.9.7-slim as spellcheck-builder
+FROM python:3.10.0-slim as spellcheck-builder
 
 LABEL "com.github.actions.name"="Spellcheck Action"
 LABEL "com.github.actions.description"="Check spelling of files in repo"