Use of `new Integer()` is deprecated

[rjzak]

Compiling with Java 21 has some deprecation warnings:

jsat/distributions/CauchyTest.java:[239,21] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/distributions/ChiSquaredTest.java:[267,29] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/distributions/ExponentialTest.java:[248,29] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/distributions/FisherSendorTest.java:[282,21] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/distributions/GammaTest.java:[40,21] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/distributions/KolmogorovTest.java:[34,21] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/distributions/LaplaceTest.java:[36,21] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/distributions/LevyTest.java:[36,21] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/distributions/LogNormalTest.java:[36,21] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/distributions/LogisticTest.java:[36,21] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/distributions/MaxwellBoltzmannTest.java:[273,29] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/distributions/NormalTest.java:[410,21] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/distributions/ParetoTest.java:[35,21] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/distributions/RayleighTest.java:[255,29] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/distributions/StudentTTest.java:[58,21] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/distributions/UniformTest.java:[36,21] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/distributions/WeibullTest.java:[36,21] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/distributions/empirical/KernelDensityEstimatorTest.java:[77,21] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/utils/IntSetFixedSizeTest.java:[51,28] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/utils/IntSetFixedSizeTest.java:[52,28] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/utils/IntSetFixedSizeTest.java:[53,30] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/utils/IntSetFixedSizeTest.java:[54,29] Integer(int) in java.lang.Integer has been deprecated and marked for removal
jsat/utils/IntSetFixedSizeTest.java:[59,26] Integer(int) in java.lang.Integer has been deprecated and marked for removal