Upgrade version of antisamy to 1.7.8 to update transitive dependency affected by CVE-2025-27820

[NilsRenaud]

The issue

ESAPI 2.6.0.0 depends on antisamy 1.7.7 which depends on apache http client 5.4.1 which has a known vulnerability: CVE-2025-27820.

The solution

Antisamy released a new version: 1.7.8 which uses on a fixed Apache HTTP Client. ESAPI only have to update its version of antisamy.

[NilsRenaud]

Woops just found out it has just been fixed: #875