[FIX] base: swap regen asset bundle to registry cache

Since [1] `model.clear_cache` is no longer recommended.
Most models were changed besides the function responsible
for regenerating asset bundles. This leads to a deprecation warning
when pressing the button in the debug menu in 16.4+

1: #119813
opw-3694331

closes odoo/odoo#150948

X-original-commit: ef0db39416c678a3a3e53ddb97971f87e912f44c
Signed-off-by: Rémy Voet (ryv) <ryv@odoo.com>
Signed-off-by: Andrew Gavgavian (andg) <andg@odoo.com>

odoo/addons/base/models/ir_attachment.py

@@ -739,4 +739,4 @@ class IrAttachment(models.Model):
             ('res_id', '=', 0),
             ('create_uid', '=', SUPERUSER_ID),
         ]).unlink()
-        self.clear_caches()
+        self.env.registry.clear_cache('assets')