Update python Docker tag to v3.10

This MR contains the following updates:

Package	Type	Update	Change
python	image	minor	3.9-alpine -> 3.10-alpine

---

Configuration

Schedule: At any time (no schedule defined).

Automerge: Disabled by config. Please merge this manually once you are satisfied.

Rebasing: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox.

Ignore: Close this MR and you won't be reminded about this update again.

---

• If you want to rebase/retry this MR, click this checkbox.

---

This MR has been generated by Renovate Bot.

.gitlab-ci.yml

 build:
-  image: python:3.9-alpine
+  image: python:3.10-alpine
   stage: build
   before_script:
     - apk add make
@@ -12,7 +12,7 @@ build:
       - public/
 
 deploy:
-  image: python:3.9-alpine
+  image: python:3.10-alpine
   stage: deploy
   only:
     - main@funkwhale/blog.funkwhale.audio