[mifos/head] 740cbf: Bump xstream from 1.3.1 to 1.4.15

[dependabot[bot] <no...@gi...>]

  Branch: refs/heads/dependabot/maven/com.thoughtworks.xstream-xstream-1.4.15
  Home:   https://github.com/mifos/head
  Commit: 740cbfce77250cfbb54e56193b20ba960190a98f
      https://github.com/mifos/head/commit/740cbfce77250cfbb54e56193b20ba960190a98f
  Author: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
  Date:   2020-12-21 (Mon, 21 Dec 2020)

  Changed paths:
    M pom.xml

  Log Message:
  -----------
  Bump xstream from 1.3.1 to 1.4.15

Bumps [xstream](https://github.com/x-stream/xstream) from 1.3.1 to 1.4.15.
- [Release notes](https://github.com/x-stream/xstream/releases)
- [Commits](https://github.com/x-stream/xstream/commits)

Signed-off-by: dependabot[bot] <su...@gi...>