deps: bump isocline for the strdup_from_utf8 overflow

isocline copied the submitted line into a buffer one byte short whenever
the locale is not UTF-8. A line whose length the allocator serves
exactly, such as the 24-byte `/screenshot path=out.png`, corrupted the
heap on Enter.

build.zig.zon

@@ -40,8 +40,8 @@
             .hash = "zenai-0.0.0-iOY_VOKsBgDYtAH8xVzBf_1BITeTJ-rZlB4stdJDPiWX",
         },
         .isocline = .{
-            .url = "git+https://github.com/arrufat/isocline#ec538faf435c616a6b38716f53980b5815c30f8a",
-            .hash = "N-V-__8AAHhtEwBIqx5nOoiGo_FLAG8gpiVC6XzZn1teMKd0",
+            .url = "git+https://github.com/arrufat/isocline#4a99434bee4a5ed04c1639514224d48cd55e1405",
+            .hash = "N-V-__8AAHxtEwB16xj2Xz-zx_uklGdTP5C2-GHXDoSzah-8",
         },
         .pcre2 = .{
             .url = "https://github.com/PCRE2Project/pcre2/releases/download/pcre2-10.48/pcre2-10.48.tar.gz",