Fix 1 ClangTidyBuild finding: * missing #include <vector> for 'std::vector'
Fix 1 ClangTidyBuild finding:
* missing #include <vector> for 'std::vector'

#codehealth

Tested:
    Local presubmit tests passed.
PiperOrigin-RevId: 469853952

fcitx/mozc,google/mozc,fcitx/mozc,google/mozc,google/mozc,google/mozc,fcitx/mozc,fcitx/mozc,fcitx/mozc,google/mozc