Fix release Action reference (as suggested by author)

[bittner]

Fixes a reference in the release workflow.

Description

The PyPI Publish Action emits a warning when gh-action-pypi-publish is used with master as a reference. The authors suggest to update to release/v1.

Motivation and Context

Background reading:

• Use up-to-date version of PyPI publish Action django-analytical#241 (comment)
• gh-action-pypi-publish README (master branch sunset)

Screenshots

Example: (taken from django-analytical)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.24%. Comparing base (e2bf17e) to head (fc3bddd).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #191      +/-   ##
==========================================
+ Coverage   97.22%   97.24%   +0.01%     
==========================================
  Files          24       25       +1     
  Lines         721      726       +5     
  Branches       56       30      -26     
==========================================
+ Hits          701      706       +5     
  Misses         14       14              
  Partials        6        6              

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