gradle-root: bump org.springdoc:springdoc-openapi-starter-webmvc-ui from 2.5.0 to 2.6.0 in /samples/web-csr/dressca-backend

gradle-root: bump org.springdoc:springdoc-openapi-starter-webmvc-ui from 2.5.0 to 2.6.0 in /samples/web-csr/dressca-backend #444