! fix link to codecentric.de blog post about future_of_ci_cd

topics/build_systems/slides/links.md

@@ -74,7 +74,7 @@ Links
 *CI/CD*
 
 [ci_vs_cd]: https://www.atlassian.com/continuous-delivery/principles/continuous-integration-vs-delivery-vs-deployment
-[future_of_ci_cd]: https://blog.codecentric.de/en/2021/03/github-actions-nextgen-cicd/
+[future_of_ci_cd]: https://codecentric.de/wissens-hub/blog/github-actions-nextgen-cicd
 [scs_techstudie_ci_cd]: https://tools.scs.ch/wiki/x/oI4uBw
 [awesome_ciandcd]: https://github.com/cicdops/awesome-ciandcd
 [awesome_jenkins]: https://github.com/sahilsk/awesome-jenkins