Fix broken CI after PG12 removal

[lkshminarayanan]

The commit cdea343 updated the gh_matrix_builder.py script but failed to import PG_LATEST variable into the script thus breaking the CI. Import that variable to fix the CI tests.

Disable-check: force-changelog-file

[github-actions]

@sb230132, @fabriziomello: please review this pull request.

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[codecov]

Codecov Report

Merging #5893 (502cd9e) into main (eaa1206) will decrease coverage by 0.85%.
The diff coverage is 91.42%.

@@            Coverage Diff             @@
##             main    #5893      +/-   ##
==========================================
- Coverage   87.90%   87.06%   -0.85%     
==========================================
  Files         239      239              
  Lines       55792    55704      -88     
  Branches    12359    12329      -30     
==========================================
- Hits        49046    48498     -548     
- Misses       4852     4873      +21     
- Partials     1894     2333     +439     

Files Changed	Coverage Δ
src/compat/compat.h	92.15% <ø> (+4.85%)	⬆️
.../constraint_aware_append/constraint_aware_append.c	84.51% <ø> (-1.77%)	⬇️
src/planner/expand_hypertable.c	89.03% <ø> (-0.32%)	⬇️
src/planner/planner.c	90.86% <ø> (-0.63%)	⬇️
src/process_utility.c	91.86% <ø> (-0.81%)	⬇️
src/utils.c	61.18% <ø> (-0.30%)	⬇️
src/utils.h	83.33% <ø> (ø)
tsl/src/bgw_policy/job.c	85.04% <ø> (-0.72%)	⬇️
tsl/src/continuous_aggs/common.c	90.06% <ø> (-0.68%)	⬇️
tsl/src/continuous_aggs/materialize.c	76.61% <ø> (-0.27%)	⬇️
... and 10 more

... and 82 files with indirect coverage changes

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