webui-vue: srcrev bump 5a9094256e..254b960f4e

Mateusz Gapski (1):
      Add the possibility to disable subscribe socket

SurenNeware (1):
      Add test hooks to server LED page

Yoshie Muranaka (2):
      Add documentation for env theming
      Fix login layout logo alt text value

(From meta-phosphor rev: 80ef32e260d92ebfd75ce8cbd5dc5a7db69f1ec7)

Change-Id: I7501014dcfe3b4087f9636597b135ee4cb100459
Signed-off-by: Andrew Geissler <openbmcbump-github@yahoo.com>
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>