[CI] Get version information from $GITHUB_REF.

[NlightNFotis]

This deactivates the usage of the bruce_adams/get-release-info
action which was problematic for our usage, in favour of getting
release info from github environment variables.

• Each commit message has a non-empty body, explaining why the change was made.
• Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

Merging #5761 (eae8d09) into develop (6c59fc8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #5761   +/-   ##
========================================
  Coverage    69.65%   69.65%           
========================================
  Files         1245     1245           
  Lines       100842   100842           
========================================
  Hits         70242    70242           
  Misses       30600    30600           

Flag	Coverage Δ
cproversmt2	43.39% <ø> (ø)
regression	66.56% <ø> (ø)
unit	32.20% <ø> (ø)

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[hannes-steffenhagen-diffblue]

Looks alright to me.