Adapt the pinned Ghostty source to the FreeBSD Zig 0.16 release.

std.mem.trimRight()/trimLeft() were renamed to trimEnd()/trimStart() before the
Zig 0.16.0 release, but this Ghostty revision still uses the old names, so the
Ghostty VT build fails on FreeBSD without this fix.

--- a/src/build/GhosttyI18n.zig
+++ b/src/build/GhosttyI18n.zig
@@ -26,7 +26,7 @@
         // so we need to remove it from `locale` to have a correct destination string.
         // (/usr/local/share/locale/en_AU/LC_MESSAGES)
         const target_locale = comptime if (builtin.target.os.tag == .freebsd)
-            std.mem.trimRight(u8, locale, ".UTF-8")
+            std.mem.trimEnd(u8, locale, ".UTF-8")
         else
             locale;
 
--- a/src/os/systemd.zig
+++ b/src/os/systemd.zig
@@ -55,7 +55,7 @@
 
             break :linux std.mem.eql(
                 u8,
-                std.mem.trimRight(u8, comm_data, "\n"),
+                std.mem.trimEnd(u8, comm_data, "\n"),
                 "systemd",
             );
         },