Bump libweb

The following commit should increase performance for slcl:

commit b0accd099fa8c5110d4c3c68830ad6fd810ca3ec
Author: Xavier Del Campo Romero <xavi.dcr@tutanota.com>
Date:   Fri Nov 24 00:52:50 2023 +0100

    http.c: Unify read operations

    So far, libweb would perform different read operations depending on its
    state:

    - For HTTP headers or request bodies, one byte at a time was read.
    - For multipart/form-data, up to BUFSIZ bytes at a time were read.

    However, this caused a significant extra number of syscalls for no
    reason and would increase code complexity, specially when parsing
    multiform/form-data boundaries.

    Now, http_read always reads up to BUFSIZ bytes at a time and process
    them on a loop. Apart from reducing code complexity, this should
    increase performance due to the (much) lower number of syscalls
    required.

libweb

@@ -1 +1 @@
-Subproject commit dec953e4f4af89149685c7463c422ccca6174cb8
+Subproject commit b0accd099fa8c5110d4c3c68830ad6fd810ca3ec