Remove unnecessary constraints

Remove unnecessary constraints.

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Build and test logs for this branch can be found at https://janitor.debian.net/scrub-obsolete/pkg/libtwelvemonkeys-java/3b37637f-9111-42cb-a328-36a56bc2f723.

debian/control

@@ -13,7 +13,7 @@ Build-Depends:
  libcommons-fileupload-java,
  libjmagick6-java,
  libmaven-javadoc-plugin-java,
- libservlet3.1-java,
+ libservlet-api-java, libjsp-api-java, libel-api-java, libwebsocket-api-java,
  libtwelvemonkeys-java
 Standards-Version: 4.6.1
 Vcs-Git: https://salsa.debian.org/java-team/libtwelvemonkeys-java.git