[Docs] Update ld cache after adding libraries

Bump version to 1.9post~UNRELEASED

Bump version to 1.9

[meson,packaging] Bump meson dependency to >= 0.58

[Docs] management-team: Since May woju is only part-time at ITL

[Docs] Describe verifying signatures

[Docs] Add maintainer's manual

[LibOS,common] Add file recovery support for encrypted files

[Docs] Update IPC, shared memory and directory renaming in features.md

[LibOS] Fix syscall mmap function signature

[Docs] Update instruction commands in documentation and LTP README

[LibOS] Fix syscall fchmodat(), mmap(), readv() error codes

[PAL/Linux-SGX] Remove symmetry check for NUMA distances

[python] Fix version in distribution

[meson] Don't set RPATH on the binaries