gh-95291: Use import helper to improve sqlite3 audit tests (GH-95292) (GH-95293)

Now the tests are correctly reported as skipped if sqlite3 is not available.
(cherry picked from commit 152eb90311)

Co-authored-by: Erlend Egeberg Aasland <erlend.aasland@protonmail.com>

Lib/test/test_audit.py

@@ -155,10 +155,7 @@ def test_http(self):
 
 
     def test_sqlite3(self):
-        try:
-            import sqlite3
-        except ImportError:
-            return
+        sqlite3 = import_helper.import_module("sqlite3")
         returncode, events, stderr = self.run_python("test_sqlite3")
         if returncode:
             self.fail(stderr)