Fix post-release workflow automation

[epassaro]

Description

The post-release workflow failed after the latest release, but worked after running manually. The actual cause seems to be well documented in the build log:

When the repository is checked out on a commit instead of a branch, the 'base' input must be supplied.

I have the feeling this is going to fail too when the pre-release is triggered via cron, so added the parameter there too.

Motivation and context

How has this been tested?

• Testing pipeline
• Other

Examples

Type of change

• Bug fix
• New feature
• Breaking change
• None of the above

Checklist

• I have updated the documentation according to my changes
• I have built the documentation by applying the build_docs label to this pull request (if you don't have enough privileges a reviewer will do it for you)
• I have requested two reviewers for this pull request

[codecov]

Codecov Report

Merging #2012 (6ee60fb) into master (66eb19f) will not change coverage.
The diff coverage is n/a.

❗ Current head 6ee60fb differs from pull request most recent head 3e8ddf2. Consider uploading reports for the commit 3e8ddf2 to get more accurate results

@@           Coverage Diff           @@
##           master    #2012   +/-   ##
=======================================
  Coverage   60.01%   60.01%           
=======================================
  Files          70       70           
  Lines        8115     8115           
=======================================
  Hits         4870     4870           
  Misses       3245     3245           

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