Update c3p0 to version 0.9.5.4 due to 3rd party vulnerability issues (CVE-2019-5427, CVE-2018-20433)

Current Situation

• Currently JOC Cockpit and JobScheduler uses the c3p0 connection pool version 0.9.5.2.
• A number of vulnerabilities affect this version, see https://www.cvedetails.com/cve/CVE-2018-20433/ and https://www.cvedetails.com/cve/CVE-2019-5427/

Desired Behavior

• Due to vulnerability Issues of older c3p0 releases the JOC Cockpit and JobScheduler should use the current version 0.9.5.4 that fixes the issues.

Maintainer Notes

• Release 1.11 that includes c3p0 version 0.9.5.2 is at its end of life. Therefore no maintenance release is provided.
• Users of release 1.11 should therefore upgrade to release 1.12.