chore(jenkins): Update Jenkins plugins

Author: gounthar

dockerfiles/plugins.txt

@@ -7,7 +7,7 @@ branch-api:2.1200.v4b_a_3da_2eb_db_4
 build-timeout:1.33
 caffeine-api:3.1.8-133.v17b_1ff2e0599
 checks-api:2.2.1
-cloudbees-folder:6.971.v9a_984fd08864
+cloudbees-folder:6.973.vc9b_85a_61e4fc
 commons-lang3-api:3.17.0-84.vb_b_938040b_078
 commons-text-api:1.12.0-129.v99a_50df237f7
 configuration-as-code:1903.v004d55388f30
@@ -22,7 +22,7 @@ git:5.6.0
 github-api:1.321-478.vc9ce627ce001
 github-branch-source:1807.v50351eb_7dd13
 github:1.40.0
-gradle:2.13.1
+gradle:2.14
 instance-identity:201.vd2a_b_5a_468a_a_6
 ionicons-api:74.v93d5eb_813d5f
 jackson2-api:2.17.0-379.v02de8ec9f64c