fix: correct duplicate entry for DevOpsDays Dallas 2025 in README.md (#1383)

Author: bendechrai

README.md

@@ -510,7 +510,6 @@ All the data (past and coming) are available publicly in JSON:
 * 15-18: [European Microsoft Fabric Community Conference 2025](http://bit.ly/4jMRTE8) - Vienna (Austria) <a href="https://sessionize.com/european-microsoft-fabric-community-conf4410"><img alt="CFP European Microsoft Fabric Community Conference 2025" src="https://img.shields.io/static/v1?label=CFP&message=until%2018-April-2025&color=green"></a>
 * 16: [KCD Washington DC 2025](https://community.cncf.io/events/details/cncf-kcd-washington-dc-presents-kcd-washington-dc-2025/) - Washington D.C. (USA)
 * 17: [Chicago Women in Technology Conference 2025](https://chiwomenintech.com/) - Chicago, IL (USA) <a href="https://www.papercall.io/chiwitcon2025"><img alt="CFP Chicago Women in Technology Conference 2025" src="https://img.shields.io/static/v1?label=CFP&message=until%2001-June-2025&color=green"></a>
-* 17-18: [DevOpsDays Dallas 2025](https://devopsdays.org/events/2025-dallas/welcome/) - Dallas, TX (USA) <a href="https://www.papercall.io/dod-dfw-2024"><img alt="CFP DevOpsDays Dallas 2025" src="https://img.shields.io/static/v1?label=CFP&message=until%2001-June-2025&color=green"></a>
 * 17-18: [DevOpsDays Dallas 2025](https://devopsdays.org/events/2025-dallas/welcome/) - Dallas, TX (USA) <a href="https://www.papercall.io/dod-dfw-2025"><img alt="CFP DevOpsDays Dallas 2025" src="https://img.shields.io/static/v1?label=CFP&message=until%2001-June-2025&color=green"></a>
 * 17-19: [Security BSides Cayman Islands 2025](https://www.bsides.ky) - George Town (Cayman Islands) <a href="https://sessionize.com/security-bsides-cayman-islands-2025"><img alt="CFP Security BSides Cayman Islands 2025" src="https://img.shields.io/static/v1?label=CFP&message=until%2015-April-2025&color=green"></a>
 * 17-20: [CascadiaJS](https://cascadiajs.com/) - Seattle (USA) <a href="https://cascadiajs.com/2025/cfp"><img alt="CFP Cascadia JS 2025" src="https://img.shields.io/static/v1?label=CFP&message=until%2027-April-2025&color=green"></a>