janet: update to 1.25.1

CHANGELOG:

## 1.25.1 - 2022-10-29

- Add `memcmp` function to core library.
- Fix bug in `os/open` with `:rw` permissions not correct on Linux.
- Support config.mk for more easily configuring the Makefile.

## 1.25.0 - 2022-10-10

- Windows FFI fixes.
- Fix PEG `if-not` combinator with captures in the condition
- Fix bug with `os/date` with nil first argument
- Fix bug with `net/accept` on Linux that could leak file descriptors to
  subprocesses
- Reduce number of hash collisions from pointer hashing
- Add optional parameter to `marshal` to skip cycle checking code

## 1.24.1 - 2022-08-24

- Fix FFI bug on Linux/Posix
- Improve parse error messages for bad delimiters.
- Add optional `name` parameter to the `short-fn` macro.

## 1.24.0 - 2022-08-14

- Add FFI support to 64-bit windows compiled with MSVC
- Don't process shared object names passed to dlopen.
- Add better support for windows console in the default shell.c for
  auto-completion and other shell-like input features.
- Improve default error message from `assert`.
- Add the `tabseq` macro for simpler table comprehensions.
- Allow setting `(dyn :task-id)` in fibers to improve context in supervisor
  messages. Prior to this change, supervisor messages over threaded channels
  would be from ambiguous threads/fibers.


(charlotte)