Update GS JPEG corruption warning for 10.7.0+

The JPEG truncation bug (1-15 bytes) persists in Ghostscript 10.7.0.
Update the warning message to show the actual GS version instead of
hardcoding "10.6.x", and remove the stale date reference. Also make
the test warning filter match the new message format.

tests/conftest.py

@@ -19,14 +19,11 @@ from ocrmypdf.exceptions import ExitCode
 
 
 class Gs106WarningFilter(logging.Filter):
-    """Filter out expected Ghostscript 10.6.x warning from test logs."""
+    """Filter out expected Ghostscript 10.6+ JPEG encoding warning from test logs."""
 
     def filter(self, record: logging.LogRecord) -> bool:
-        # Allow all records except the expected Ghostscript 10.6.x warning
-        return (
-            "Ghostscript 10.6.x contains JPEG encoding errors"
-            not in record.getMessage()
-        )
+        # Allow all records except the expected Ghostscript 10.6+ warning
+        return "contains JPEG encoding errors" not in record.getMessage()
 
 
 @pytest.fixture(autouse=True)