made spring 2024 current sem in udls page

[benpm]

Changes/Additions

updated UDLS page to say 2024 spring is current semester

Checklist

• [x] I've done a spell and grammar check.
• [x] I've built and tested my changes locally.
• [x] My branch is up to date with the latest main.
• [x] I've requested a reviewer when my work is ready to merge.

[sohambagchi]

The 'Spring 2024 (Current)' heading+table should be above the 'Past UDLS Lineups' heading