uim: use gcc13

gcc14 would throw:

```
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I../uim -I../replace -I../uim -g -O2 -pedantic -pipe -Wall -Wchar-subscripts -Wmissing-declarations -Wredundant-decls -Wmissing-prototypes -Wnested-externs -Wpointer-arith -Wcast-align -Wsign-compare -Wno-long-long -Wno-overlength-strings -DNDEBUG -c bsd-snprintf.c  -fPIC -DPIC -o .libs/bsd-snprintf.o
bsd-snprintf.c: In function 'dopr':
bsd-snprintf.c:104:38: error: assignment to expression with array type
  104 | #   define VA_COPY(dest, src) (dest) = (src)
      |                                      ^
bsd-snprintf.c:186:9: note: in expansion of macro 'VA_COPY'
  186 |         VA_COPY(args, args_in);
      |         ^~~~~~~
```

and I don't have the motivation to debug autohell crap.

pkgs/tools/inputmethods/uim/default.nix

@@ -1,6 +1,7 @@
-{
+args@{
   lib,
   stdenv,
+  gcc13Stdenv,
   fetchFromGitHub,
   fetchpatch,
   shared-mime-info,
@@ -53,6 +54,10 @@ assert withNetworking -> curl != null && openssl != null;
 assert withFFI -> libffi != null;
 assert withMisc -> libeb != null;
 
+let
+  stdenv = if args.stdenv.cc.isGNU then args.gcc13Stdenv else args.stdenv;
+in
+
 stdenv.mkDerivation rec {
   version = "1.8.8";
   pname = "uim";