Update dependency com.sun.mail:jakarta.mail to v1.6.8 (#150)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gradle/libs.versions.toml

@@ -6,7 +6,7 @@ httpcomponents = "4.5.14"
 jackson = "2.20"
 jakarta-activation = "1.2.2"
 jakarta-inject = "1.0.5"
-jakarta-mail = "1.6.7"
+jakarta-mail = "1.6.8"
 jakarta-servlet = "4.0.4"
 jsr305 = "3.0.2"
 junit5 = "5.13.4"