Libarchive 3.6.1

Libarchive 3.6.1 is a bugfix and security release.

Security fixes:

• 7zip reader: fix PPMD read beyond boundary (#1671)
• ZIP reader: fix possible out of bounds read (OSS-Fuzz 38766 #1672)
• ISO reader: fix possible heap buffer overflow in read_children() (OSS-Fuzz 38764, #1685)
• RARv4 redaer: fix multiple issues in RARv4 filter code (introduced in libarchive 3.6.0)
  • fix heap use after free in archive_read_format_rar_read_data() (OSS-Fuzz 44547, 52efa50)
  • fix null dereference in read_data_compressed() (OSS-Fuzz 44843, 1271f77)
  • fix heap user after free in run_filters() (OSS-Fuzz 46279, #1715)