cmake: drop posix dependency from pcre* detection

since f585b129 neither PCRE nor PCRE2 backends rely on POSIX regex, so
reflect it in library detection logic

fix interactive rebase detect.

Fix internal git_sysdir_find* function usage within public git_config_find* functions

ntlmclient: LibreSSL 3.5 removed HMAC_CTX_cleanup

ci: update dockerfiles for mbedTLS new url

Update the new URL for mbedTLS.

CI: limits actions scheduled workflows to the main repo

Only run scheduled workflows on the main repository; prevents people
from using build minutes on their forks.

https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-3.5.0-relnotes.txt

Modify guard to declare dummy function.

filter: Fix Segfault

Co-authored-by: Edward Thomson <ethomson@github.com>

repo: allow administrator to own the configuration

status: update documentation for default options

config: update config entry iteration lifecycle

Update our ownership checks that were introduced in libgit2 v1.4.3
(to combat CVE 2022-24765). These were not compatible with git's; git
itself allows administrators to own the path. Our checks now match
this behavior.

Look for `getentropy` and flag its existence.