Upgrade bundled PMD to version 5.5.3 containing many Security rules contributed by the Salesforce Security team.

https://pmd.github.io/pmd-5.5.3/overview/changelog.html#Apex_Security_Rule_Set

Small adjustment after release of 1.3

Adds Security rules created by the Security team of Salesforce.com:

• SOQL injection
• XSS
• CSRF
• Open redirects
• Bad crypto
• Insecure HTTP endpoints

Changelog:

• Fixeshttps://github.com/Up2Go/codeclimate-apexmetrics/issues/24
• Merged PRhttps://github.com/Up2Go/pmd/pull/43

Changelog:

• Fix forhttps://login.salesforce.com/packaging/installPackage.apexp?p0=04td0000001MLbK
• Upgrades to PMD 5.5.0