Fix compilerArgs option for the maven-compiler-plugin

[Monichev]

-Xlint should be inside <arg></arg> according to the documentation

[codecov]

Codecov Report

Merging #1248 into dev will decrease coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                dev    #1248      +/-   ##
============================================
- Coverage     74.64%   74.58%   -0.06%     
+ Complexity      559      557       -2     
============================================
  Files            24       24              
  Lines          1948     1948              
  Branches        267      267              
============================================
- Hits           1454     1453       -1     
  Misses          350      350              
- Partials        144      145       +1

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/com/zaxxer/hikari/pool/PoolBase.java	69.2% <0%> (-0.37%)	54% <0%> (-1%)

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