[Bug]: Fix Regular Expression within release workflow

[harryswift01]

Bug Report

Description

The GitHub Actions release workflow is not successfully publishing the CodeEntropy Conda package to Anaconda.org.

Expected Behavior

When the release workflow is triggered, it should:

1. Build the Conda package from conda-recipe/meta.yaml
2. Upload the built artifact to the CCPBioSim Anaconda.org organisation channel

Actual Behavior

The workflow fails during the Conda publish stage and does not upload the package to Anaconda.org.

Steps to Reproduce

1. Go to GitHub Actions → Release CodeEntropy
2. Run workflow (workflow_dispatch) with a valid version number (e.g. 1.2.3)
3. Observe failure in the conda job (publish step)

Relevant Logs / Error Message

• Example failure seen:
  • sed: -e expression #1, char 57: Invalid preceding regular expression
  • Exit code: 1

Environment

• GitHub Actions runner: ubuntu-24.04
• Conda setup: conda-incubator/setup-miniconda@v3 (Miniforge)
• Package recipe location: conda-recipe/meta.yaml
• Upload method: anaconda-client using ANACONDA_TOKEN

Additional Context

The Conda recipe uses Jinja templating ({% ... %}), and the workflow updates the recipe version using sed before building/uploading.