ci: remove JDK 14

[bradh]

Motivation and Context

JDK 14 is EOL, and is pretty pointless to test given we have JDK 11 and JDK 17 in the mix.

Its also continuing to give trouble - see #403. I've seen the problem on other JDKs, but JDK 14 running appears to be the worst example.

Description

Removes GitHub workflow for JDK 14 for the 2.x branch.

How Has This Been Tested?

Only tested as part of this PR.

Screenshots (if appropriate):

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 read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

Merging #415 (41353b9) into 2.x (2bac88a) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##                2.x     #415   +/-   ##
=========================================
  Coverage     91.03%   91.03%           
  Complexity     5610     5610           
=========================================
  Files           610      610           
  Lines         14571    14571           
  Branches       1379     1379           
=========================================
  Hits          13265    13265           
  Misses         1269     1269           
  Partials         37       37           

Flag	Coverage Δ
unittests-api	98.67% <ø> (ø)
unittests-api-ffmpeg	15.85% <ø> (ø)
unittests-awt	100.00% <ø> (ø)
unittests-core	98.44% <ø> (ø)
unittests-geoid	100.00% <ø> (ø)
unittests-mimd	97.24% <ø> (ø)
unittests-st0601	99.26% <ø> (ø)
unittests-st0602	99.06% <ø> (ø)
unittests-st0805	99.17% <ø> (ø)
unittests-st0806	99.64% <ø> (ø)
unittests-st0808	99.08% <ø> (ø)
unittests-st0809	99.11% <ø> (ø)
unittests-st0903-vmti	98.79% <ø> (ø)
unittests-st0903-vtrack	97.09% <ø> (ø)
unittests-st1108	99.66% <ø> (ø)
unittests-st1206	99.59% <ø> (ø)
unittests-st1301	98.91% <ø> (ø)
unittests-st1403	100.00% <ø> (ø)
unittests-st1601	100.00% <ø> (ø)
unittests-st1602	100.00% <ø> (ø)
unittests-st1603	98.03% <ø> (ø)
unittests-st1909	99.65% <ø> (ø)

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