test: fix ulp difference

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---

Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/gammainc/test/test.js

@@ -108,7 +108,6 @@ tape( 'the function correctly evaluates the lower incomplete gamma function for
 		b2 = isnan( expected[ i ] );
 		t.strictEqual( b1, b2, 'returns expected value' );
 		if ( !b1 || !b2 ) {
-			// TODO: The difference is larger here as compared to the native tests. This is likely because the C implementation follows the latest Boost implementation, unlike the JS implementation.
 			t.strictEqual( ulpdiff( actual, expected[ i ] ) <= 45, true, 'returns expected value within 45 ulp' );
 		}
 	}
@@ -499,7 +498,6 @@ tape( 'the function correctly evaluates the upper incomplete gamma function for
 		b2 = isnan( expected[ i ] );
 		t.strictEqual( b1, b2, 'returns expected value' );
 		if ( !b1 || !b2 ) {
-			// TODO: The difference is larger here as compared to the native tests. This is likely because the C implementation follows the latest Boost implementation, unlike the JS implementation.
 			t.strictEqual( ulpdiff( actual, expected[ i ] ) <= 134, true, 'returns expected value within 131 ulp' );
 		}
 	}

lib/node_modules/@stdlib/math/base/special/gammainc/test/test.native.js

@@ -117,7 +117,7 @@ tape( 'the function correctly evaluates the lower incomplete gamma function for
 		b2 = isnan( expected[ i ] );
 		t.strictEqual( b1, b2, 'returns expected value' );
 		if ( !b1 || !b2 ) {
-			t.strictEqual( ulpdiff( actual, expected[ i ] ) <= 44, true, 'returns expected value within 44 ulp' );
+			t.strictEqual( ulpdiff( actual, expected[ i ] ) <= 45, true, 'returns expected value within 45 ulp' );
 		}
 	}
 	t.end();
@@ -507,7 +507,7 @@ tape( 'the function correctly evaluates the upper incomplete gamma function for
 		b2 = isnan( expected[ i ] );
 		t.strictEqual( b1, b2, 'returns expected value' );
 		if ( !b1 || !b2 ) {
-			t.strictEqual( ulpdiff( actual, expected[ i ] ) <= 130, true, 'returns expected value within 130 ulp' );
+			t.strictEqual( ulpdiff( actual, expected[ i ] ) <= 134, true, 'returns expected value within 131 ulp' );
 		}
 	}
 	t.end();