update gradle, minor refactor

Signed-off-by: neo <1100909+neowu@users.noreply.github.com>

Author: neowu

buildSrc/build.gradle.kts

@@ -9,12 +9,13 @@ repositories {
 
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(21))
+        // kotlin doesn't support Java 24 yet
+        languageVersion = JavaLanguageVersion.of(21)
     }
 }
 
 dependencies {
-    implementation("com.github.spotbugs.snom:spotbugs-gradle-plugin:6.1.2")
+    implementation("com.github.spotbugs.snom:spotbugs-gradle-plugin:6.1.13")
     implementation("org.flywaydb:flyway-gradle-plugin:11.2.0")
     implementation("org.flywaydb:flyway-mysql:11.2.0")
 }

core-ng/src/main/java/core/framework/internal/web/http/IPv6Ranges.java

@@ -102,7 +102,7 @@ private LongLong[] sortableRange(String cidr) {
             rangeStart = new LongLong(address.high & highMask, 0x0000_0000_0000_0000L);
             rangeEnd = new LongLong(rangeStart.high | ~highMask, 0xFFFF_FFFF_FFFF_FFFFL);
         } else {
-            long lowMask = -1L << (128 - maskBits);
+            long lowMask = 0xFFFF_FFFF_FFFF_FFFFL << (128 - maskBits);
             rangeStart = new LongLong(address.high, address.low & lowMask);
             rangeEnd = new LongLong(address.high, rangeStart.low | ~lowMask);
         }