remove redundant reflective class access

[kamilkrzywanski]

Remove redundant reflective class access. Since this project it's only java 8 it's necessary

[codecov]

Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (a2e40f1) to head (7bfd24c).
⚠️ Report is 4 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
.../main/java/com/querydsl/r2dbc/JavaTypeMapping.java	0.00%	7 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #1426    +/-   ##
=======================================
  Coverage    0.00%   0.00%            
=======================================
  Files         813     838    +25     
  Lines       31271   31587   +316     
  Branches     3550    3558     +8     
=======================================
- Misses      31271   31587   +316     

Flag	Coverage Δ
cubrid	0.00% <0.00%> (?)
db2	0.00% <0.00%> (?)
embedded	0.00% <0.00%> (?)
examples	0.00% <0.00%> (?)
firebird	0.00% <0.00%> (?)
mongodb	0.00% <0.00%> (?)
mysql	0.00% <0.00%> (?)
oracle	0.00% <0.00%> (?)
postgresql	0.00% <0.00%> (?)
test	0.00% <0.00%> (ø)

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