Spelling error in message_signed_base

[jcmmagnusson]

Bug Metadata

• Version of extract_msg: 0.48.4
• Your python version: Python 3.11
• How did you launch extract_msg?
  • I used the extract_msg package

Describe the bug
On line 133 in message_signed_base.py there is a typo ("html.escpae") that is causing an error when reaching this code path.

[TheElementalOfDestruction]

Fixed in version 0.48.5. Thanks.