ci: Fix jacoco config

[petertrr]

• Don't include test classes

[codecov]

Codecov Report

Merging #17 (ddff3a3) into main (5479bd8) will decrease coverage by 8.80%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main      #17      +/-   ##
============================================
- Coverage     91.81%   83.01%   -8.81%     
+ Complexity      172       99      -73     
============================================
  Files            18       12       -6     
  Lines          1197      518     -679     
  Branches        103       91      -12     
============================================
- Hits           1099      430     -669     
+ Misses           69       63       -6     
+ Partials         29       25       -4     

Flag	Coverage Δ
unittests	83.01% <ø> (-8.81%)	⬇️

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Impacted Files	Coverage Δ
...n/io/github/petertrr/diffutils/utils/DeltaUtils.kt
...tlin/io/github/petertrr/diffutils/DiffUtilsTest.kt
...in/io/github/petertrr/diffutils/patch/PatchTest.kt
.../github/petertrr/diffutils/text/StringUtilsTest.kt
...ub/petertrr/diffutils/text/DiffRowGeneratorTest.kt
...etertrr/diffutils/algorithm/myers/MyersDiffTest.kt

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