Update fmt version to 10.2.1 (#297)

Summary: Pull Request resolved: #297

Reviewed By: jaesoo-fb

Differential Revision: D55167653

Pulled By: jiayuebao

fbshipit-source-id: 2e01ccc1f410f3fd589147214cf9ea6a41e27b99

Author: haowu14

contrib/build-package.sh

@@ -161,7 +161,7 @@ case "$1" in
     REPODIR=cachelib/external/$NAME
     SRCDIR=$REPODIR
     external_git_clone=yes
-    external_git_tag="8.0.1"
+    external_git_tag="10.2.1"
     cmake_custom_params="-DBUILD_SHARED_LIBS=ON"
     if test "$build_tests" = "yes" ; then
         cmake_custom_params="$cmake_custom_params -DFMT_TEST=YES"