Sonar fix: No increment operator on a floating point variable

Author: aherbert

commons-numbers-gamma/src/test/java/org/apache/commons/numbers/gamma/DigammaTest.java

@@ -52,7 +52,7 @@ void testDigammaSmallArgs() {
             -1.0000000000005772157e12, -1.0000000000000577216e13, -1.0000000000000057722e14, -1.0000000000000005772e15, -1e+16,
             -1e+17, -1e+18, -1e+19, -1e+20, -1e+21, -1e+22, -1e+23, -1e+24, -1e+25, -1e+26,
             -1e+27, -1e+28, -1e+29, -1e+30};
-        for (double n = 1; n < 30; n++) {
+        for (double n = 1; n < 30; n += 1) {
             checkRelativeError(String.format("Test %.0f: ", n), expected[(int) (n - 1)], Digamma.value(Math.pow(10.0, -n)), 1e-8);
         }
     }