pin confection to at least 0.1.3

[svlandeg]

Description

Ensure that the latest version of confection is installed.

Corresponding documentation PR

NA

Types of change

bug fix, cf #289

Checklist

• I confirm that I have the right to submit this contribution under the project's MIT license.
• I ran all tests in tests and usage_examples/tests, and all new and existing tests passed. This includes
  • all external tests (i. e. pytest ran with --external)
  • all tests requiring a GPU (i. e. pytest ran with --gpu)
• My changes don't require a change to the documentation, or if they do, I've added all required information.