[Bug] Fix non-short-circuit operator in for-loop condition

[cxhello]

Background

Follow-up to #14469 (SpotBugs check enforcement). This addresses the NS_DANGEROUS_NON_SHORT_CIRCUIT pattern — using the non-short-circuit operator & instead of && in a boolean expression. When used in a for-loop condition, & always evaluates both operands even when the first is already false, which is unnecessary and potentially dangerous.

Affected locations (1 occurrence)

File	Line	Current code
core/.../NacosServerLoaderService.java	L137	for (int i = 0; i < overLimitServer.size() & i < lowLimitServer.size(); i++)

The & operator evaluates both i < overLimitServer.size() and i < lowLimitServer.size() unconditionally. With &&, the second condition would be skipped when the first is already false, which is the correct short-circuit behavior for a loop guard.

Fix

Replace & with && in the for-loop condition (single character change):

- for (int i = 0; i < overLimitServer.size() & i < lowLimitServer.size(); i++) {
+ for (int i = 0; i < overLimitServer.size() && i < lowLimitServer.size(); i++) {

After fixing, the NS_DANGEROUS_NON_SHORT_CIRCUIT exclusion in style/spotbugs-exclude.xml should be removed so that future occurrences are caught by CI.

[java-acc]

@KomachiSion @cxhello #14509 #14510 没有人处理吗？如果没有人，我可以一起解决。

[cxhello]

@java-acc 可以