chore(NODE-6635): pin NPM to 10 when Node version is 18 (#226)

Author: durran

.evergreen/install-dependencies.sh

@@ -7,11 +7,8 @@ set -o errexit  # Exit the script with error if any of the commands fail
 ## a full nodejs version, in the format v<major>.<minor>.patch
 export NODE_LTS_VERSION=${NODE_LTS_VERSION:-14}
 # npm version can be defined in the environment for cases where we need to install
-# a version lower than latest to support EOL Node versions.
-export NPM_VERSION=${NPM_VERSION:-latest}
-
-echo "Installing Node.js $NODE_LTS_VERSION with npm@$NPM_VERSION"
-
+# a version lower than latest to support EOL Node versions. When not provided will
+# be handled by this script in drivers tools.
 source $DRIVERS_TOOLS/.evergreen/install-node.sh
 
 npm install --build-from-source