[Security] Bump xstream from 1.4.12 to 1.4.14-jdk7

[dependabot-preview]

Bumps xstream from 1.4.12 to 1.4.14-jdk7.

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[dependabot-preview]

We've just been alerted that this update fixes a security vulnerability:

Sourced from The GitHub Security Advisory Database.

XStream can be used for Remote Code Execution

Impact

The vulnerability may allow a remote attacker to run arbitrary shell commands only by manipulating the processed input stream.

Patches

If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.14.

Workarounds

No user is affected, who followed the recommendation to setup XStream's Security Framework with a whitelist! Anyone relying on XStream's default blacklist can immediately switch to a whilelist for the allowed types to avoid the vulnerability.

Users of XStream 1.4.13 or below who still want to use XStream default blacklist can use a workaround depending on their version in use.
... (truncated)

Affected versions: ["<= 1.4.13"]

[dependabot-preview]

Superseded by #173.