Update summary plots with O4 dates

gpstime of O4 start: 1368975618

| UTC | May 24, 2023 | 15:00:00 | UTC |

| Central | May 24, 2023 | 10:00:00 | CDT |

| Pacific | May 24, 2023 | 08:00:00 | PDT |

This would need to be updated in summary.py to be called O4 not O3 start time and the gpstime in config.py

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