Point the timetable link at the 2026-2027 course offering code

The numeric offering code in the rooster link no longer resolves and the timetable page reports an unknown code. The link now uses the course offering WBAS002-05.2026-2027.1, which opens the 2026-2027 schedule.

Author: timlichtenberg

book/course_info.md

@@ -20,7 +20,7 @@ The official course catalogue entry is maintained in [Ocasys](https://ocasys.rug
 | **Coordinator and lecturer** | dr. [Tim Lichtenberg](https://timlichtenberg.net/) |
 | **Guest lecturer** | dr. [Mara Attia](https://maraattia.github.io/) (they/them), Atmospheres I and II |
 | **Teaching assistants** | [Mariana Sastre](https://planetmariana.github.io/), [Emma Postolec](https://research.rug.nl/en/persons/emma-postolec), [Soumil Kelkar](https://research.rug.nl/en/persons/soumil-kelkar), [Imre Kisvárdai](https://research.rug.nl/en/persons/imre-kisvardai) |
-| **Timetable** | [rooster.rug.nl](https://rooster.rug.nl/2026-2027?courseOffering=195171) |
+| **Timetable** | [rooster.rug.nl](https://rooster.rug.nl/2026-2027?courseOffering=WBAS002-05.2026-2027.1) |
 | **Contact** | [tim.lichtenberg@rug.nl](mailto:tim.lichtenberg@rug.nl) |
 | **Tutorial and worksheet questions** | [ips-tas-2026@formingworlds.space](mailto:ips-tas-2026@formingworlds.space) |