[hotfix] Remove DEPENDENCIES file.

Previously, this fiel pointed to the different versions of the LICENSE
and NOTICE files (source version, bin version). Since we dropped the
convenience binary distribution LICENSE and NOTICE files and only ship the
source release related ones, this is no longer necessary.

DEPENDENCIES

-Apache Flink dependencies
-
-The Apache Flink project depends on various components with separate copyright
-notices and license terms. Your use of these subcomponents is subject
-to the terms and conditions of their respective licenses.
-
- - See files "LICENSE" and "NOTICE" for licenses and notice files (per section 4(d) of
-   the Apache License) relating to files and dependencies distributed with the
-   Apache Flink sources.
-
- - See files "flink-dist/src/main/flink-bin/LICENSE" and "flink-dist/src/main/flink-bin/NOTICE"
-   for licenses and notice files (per section 4(d) of the Apache License) relating
-   to dependencies bundled with the binary distribution of Apache Flink.
-