Mark things which can be private as private

Co-authored-by: Tony Torralba <atorralba@users.noreply.github.com>

java/ql/lib/semmle/code/java/security/InsecureBeanValidationQuery.qll

@@ -8,7 +8,7 @@ private import semmle.code.java.dataflow.ExternalFlow
 /**
  * A message interpolator Type that perform Expression Language (EL) evaluations.
  */
-class ELMessageInterpolatorType extends RefType {
+private class ELMessageInterpolatorType extends RefType {
   ELMessageInterpolatorType() {
     this.getASourceSupertype*()
         .hasQualifiedName("org.hibernate.validator.messageinterpolation",
@@ -19,7 +19,7 @@ class ELMessageInterpolatorType extends RefType {
 /**
  * A method call that sets the application's default message interpolator.
  */
-class SetMessageInterpolatorCall extends MethodAccess {
+private class SetMessageInterpolatorCall extends MethodAccess {
   SetMessageInterpolatorCall() {
     exists(Method m, RefType t |
       this.getMethod() = m and

java/ql/lib/semmle/code/java/security/ZipSlipQuery.qll

@@ -10,7 +10,7 @@ private import semmle.code.java.dataflow.ExternalFlow
 /**
  * A method that returns the name of an archive entry.
  */
-class ArchiveEntryNameMethod extends Method {
+private class ArchiveEntryNameMethod extends Method {
   ArchiveEntryNameMethod() {
     exists(RefType archiveEntry |
       archiveEntry.hasQualifiedName("java.util.zip", "ZipEntry") or