[gcc r16-4297] libstdc++: Add missing include to std/time/format/format.cc

[Jonathan Wakely]

https://gcc.gnu.org/g:9e2db0f899d3a660cc25918bcd9f5b6c874526fa

commit r16-4297-g9e2db0f899d3a660cc25918bcd9f5b6c874526fa
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Oct 8 10:14:27 2025 +0100

    libstdc++: Add missing include to std/time/format/format.cc
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/std/time/format/format.cc: Include <vector>.

Diff:
---
 libstdc++-v3/testsuite/std/time/format/format.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libstdc++-v3/testsuite/std/time/format/format.cc b/libstdc++-v3/testsuite/std/time/format/format.cc
index 00affb9e11a3..d1aee053acd4 100644
--- a/libstdc++-v3/testsuite/std/time/format/format.cc
+++ b/libstdc++-v3/testsuite/std/time/format/format.cc
@@ -2,6 +2,7 @@
 // { dg-timeout-factor 2 }
 
 #include <chrono>
+#include <vector>
 #include <testsuite_hooks.h>
 
 void