[lldb] [Process/FreeBSD] Assume minimum is FreeBSD 14 (#179587)

Currently versions under 13 are EOLed (see [FreeBSD Release
Information](https://www.freebsd.org/releases/)).

FreeBSD 13 will be EOLed by April 30th (see [Supported FreeBSD
releases](https://www.freebsd.org/security/#sup)) while LLVM 23 is
expected to be released in August 25th according to the LLVM calendar.

Thus assumed that minimum supported FreeBSD version is 14.

Signed-off-by: Minsoo Choo <minsoochoo0122@proton.me>
GitOrigin-RevId: bc706338c11af35d17af996409fd804f92a51207