fix: use c3P0 v0.9.5.4 to prevent DoS vulnerability. See https://github.com/swaldman/c3p0/blob/c3p0-0.9.5.4/src/dist-static/RELEASE_NOTES-c3p0-0.9.5.4
fix: use c3P0 v0.9.5.4 to prevent DoS vulnerability. See https://github.com/swaldman/c3p0/blob/c3p0-0.9.5.4/src/dist-static/RELEASE_NOTES-c3p0-0.9.5.4

(cherry picked from commit 55bf8ad1659820fb6f4e195aee7c111dc7d219ef)

vert-x3/vertx-jdbc-client