gradle-dressca-backend: bump org.springdoc:springdoc-openapi-starter-webmvc-ui from 2.8.1 to 2.8.3 in /samples/web-csr/dressca-backend

gradle-dressca-backend: bump org.springdoc:springdoc-openapi-starter-webmvc-ui from 2.8.1 to 2.8.3 in /samples/web-csr/dressca-backend #583