Fix format overflow errors from GCC13 in require.c

In function ‘compareVersions’,
    inlined from ‘require_priv’ at .././src/require.c:1025:29:
.././src/require.c:640:9: warning: ‘%s’ directive argument is null [-Wformat-overflow=]
  640 |   debug("require: compareVersions(found=%s, request=%s)\n", found, request);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.././src/require.c:601:28: note: in definition of macro ‘debug’
  601 |   if (requireDebug) printf(__VA_ARGS__)
      |                            ^~~~~~~~~~~
.././src/require.c: In function ‘require_priv’:
.././src/require.c:640:53: note: format string is defined here
  640 |   debug("require: compareVersions(found=%s, request=%s)\n", found, request);
      |                                                     ^~
In function ‘compareVersions’,
    inlined from ‘require_priv’ at .././src/require.c:1025:29:
.././src/require.c:640:9: warning: ‘%s’ directive argument is null [-Wformat-overflow=]
  640 |   debug("require: compareVersions(found=%s, request=%s)\n", found, request);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.././src/require.c:601:28: note: in definition of macro ‘debug’
  601 |   if (requireDebug) printf(__VA_ARGS__)
      |                            ^~~~~~~~~~~
.././src/require.c: In function ‘require_priv’:
.././src/require.c:640:53: note: format string is defined here
  640 |   debug("require: compareVersions(found=%s, request=%s)\n", found, request);
      |                                                     ^~
.././src/require.c:1031:50: warning: ‘%s’ directive argument is null [-Wformat-overflow=]
 1031 |                 printf("require: %s %s may match %s\n", module, currentFilename,
      |                                                  ^~