add pyhep2025 users workshop link (#1743)

* add pyhep2025 users workshop link

* Update _activities/pyhep.md

---------

Co-authored-by: Eduardo Rodrigues <[email protected]>

Author: ianna

_activities/pyhep.md

@@ -53,8 +53,8 @@ with the aim to provide an environment to discuss and promote the usage of Pytho
 {:.table .table-hover .table-condensed .table-striped}
 | *Workshop*     | *Location*             | *Date*                | *Agenda link*                                                                         |
 | -------------- | ---------------------- | ----------------------| ------------------------------------------------------------------------------------- |
-| PyHEP 2025     | Online workshop        | October 27-30, 2025   | tba                                                                                   |
-| PyHEP 2025.dev | Seattle, WA, USA       | July 14-17, 2025      | [Indico](https://indico.cern.ch/e/PyHEP2025.dev){:target="_pyhep2025_dev_indico"}       |
+| PyHEP 2025     | Online workshop        | October 27-30, 2025   | [Indico](https://indico.cern.ch/e/PyHEP2025){:target="_pyhep2025_indico"}             |
+| PyHEP 2025.dev | Seattle, WA, USA       | July 14-17, 2025      | [Indico](https://indico.cern.ch/e/PyHEP2025.dev){:target="_pyhep2025_dev_indico"}     |
 | PyHEP 2024.dev | Aachen, Germany        | August 26-30, 2024    | [Indico](https://indico.cern.ch/e/PyHEP2024.dev){:target="_pyhep2024_dev_indico"}     |
 | PyHEP 2024     | Online workshop        | July 1-4, 2024        | [Indico](https://indico.cern.ch/e/PyHEP2024){:target="_pyhep2024_indico"}             |
 | PyHEP 2023     | Online workshop        | October 9-12, 2023    | [Indico](https://indico.cern.ch/e/PyHEP2023){:target="_pyhep2023_indico"}             |