Use java 8 to publish snapshots

[Lipen]

This PR updates CI workflow for publishing snapshots to use JDK 8.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.52%. Comparing base (5acbadf) to head (9de991d).

Additional details and impacted files

@@             Coverage Diff              @@
##                neo     #337      +/-   ##
============================================
- Coverage     69.53%   69.52%   -0.01%     
+ Complexity     2492     2491       -1     
============================================
  Files           275      275              
  Lines         15646    15646              
  Branches       2354     2354              
============================================
- Hits          10879    10878       -1     
  Misses         3837     3837              
- Partials        930      931       +1     

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🚀 New features to boost your workflow:

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[github-actions]

Test Results

  215 files  ±0    215 suites  ±0   16m 15s ⏱️ +24s
  711 tests ±0    699 ✅ ±0  12 💤 ±0  0 ❌ ±0 
1 977 runs  ±0  1 927 ✅ ±0  50 💤 ±0  0 ❌ ±0 

Results for commit 9de991d. ± Comparison against base commit 5acbadf.

♻️ This comment has been updated with latest results.