don't pin npm

Author: baileympearson

.evergreen/config.in.yml

@@ -1158,7 +1158,6 @@ tasks:
         params:
           updates:
             - { key: NODE_LTS_VERSION, value: v22.11.0 }
-            - { key: NPM_VERSION, value: "9" }
             - { key: VERSION, value: v6.0-perf }
             - { key: TOPOLOGY, value: server }
             - { key: AUTH, value: noauth }

.evergreen/config.yml

@@ -1119,7 +1119,6 @@ tasks:
         params:
           updates:
             - {key: NODE_LTS_VERSION, value: v22.11.0}
-            - {key: NPM_VERSION, value: '9'}
             - {key: VERSION, value: v6.0-perf}
             - {key: TOPOLOGY, value: server}
             - {key: AUTH, value: noauth}