Qualify the LinkedHashMap size() call in removeEldestEntry (CodeQL java/subtle-inherited-call)

[vharseko]

Summary

Resolves the java/subtle-inherited-call alert in AccessTokenValidationCache.

The cache is backed by an anonymous LinkedHashMap subclass whose
removeEldestEntry override calls an unqualified size():

protected boolean removeEldestEntry(Map.Entry<...> eldestEntry) {
    return size() > maxSize;
}

size() binds to LinkedHashMap.size() (the map's own size — the correct,
standard LRU idiom). But the enclosing AccessTokenValidationCache also declares
a size() method, so a reader could mistake the call for the enclosing one — and
that enclosing size() re-acquires the read lock, which would be wrong here since
removeEldestEntry runs inside put() while the write lock is already held.

Fix

Qualify the call as super.size(), making it explicit that the map's own
inherited size is intended. This is behaviour-preserving — the unqualified call
already resolved to LinkedHashMap.size().

Testing

mvn -o -pl commons/auth-filters/authz-filter/modules/oauth2-module compile — BUILD SUCCESS.