Moderate: libsepol security update (Oracle Linux 8)

[2.9-3]
- cil: Fix out-of-bound read of file context pattern ending with '\'
- cil: Destroy classperms list when resetting classpermission (#1983517)
- cil: Destroy classperm list when resetting map perms (#1983521)
- cil: cil_reset_classperms_set() should not reset classpermission (#1983525)
- cil: Set class field to NULL when resetting struct cil_classperms
- cil: More strict verification of constraint leaf expressions
- cil: Exit with an error if declaration name is a reserved word
- cil: Allow permission expressions when using map classes
- cil: Reorder checks for invalid rules when building AST
- cil: Cleanup build AST helper functions
- cil: Create new first child helper function for building AST
- cil: Remove unused field from struct cil_args_resolve
- cil: Destroy disabled optional blocks after pass is complete
- cil: Check if name is a macro parameter first
- cil: fix NULL pointer dereference in __cil_insert_name
- cil: Report disabling an optional block only at high verbose levels
- cil: Use AST to track blocks and optionals when resolving
- cil: Reorder checks for invalid rules when resolving AST
- cil: Sync checks for invalid rules in booleanifs
- cil: Check for statements not allowed in optional blocks (#1983530)