sysutils/screen: Update 4.9.0 --> 4.9.1

Version 4.9.1 (20/08/2023):

• Support stop/parity bits on serial port (#23952)
• Add needed system headers in checks and return values for implicit function declarations
• Fixes:
  • Avoid zombies after shell exit (#25089)
  • Missed signal sending permission check on failed query messages (CVE-2023-24626)
  • manpage fixes
  • source code fixes during cleanup
  • UTF-8 encoding can emit invalid UTF-8 sequences for out of range unicode values (#62097)