chore(NODE-6637): remove drivers tools env setting

.evergreen/install-dependencies.sh

@@ -9,16 +9,6 @@ export NODE_LTS_VERSION=${NODE_LTS_VERSION:-16}
 # 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.
 
-# If NODE_LTS_VERSION is numeric and less than 18, default to 9, if less than 20, default to 10.
-# Do not override if it is already set.
-if [[ "$NODE_LTS_VERSION" =~ ^[0-9]+$ && "$NODE_LTS_VERSION" -lt 18 ]]; then
-    export NPM_VERSION=${NPM_VERSION:-9}
-elif [[ "$NODE_LTS_VERSION" =~ ^[0-9]+$ && "$NODE_LTS_VERSION" -lt 20 ]]; then
-    export NPM_VERSION=${NPM_VERSION:-10}
-else
-    export NPM_VERSION=${NPM_VERSION:-latest}
-fi
-
 source $DRIVERS_TOOLS/.evergreen/install-node.sh
 
 npm install "${NPM_OPTIONS}"

.evergreen/prepare-shell.sh

@@ -32,7 +32,7 @@ export PATH="$MONGODB_BINARIES:$PATH"
 
 if [ ! -d "$DRIVERS_TOOLS" ]; then
   # Only clone driver tools if it does not exist
-  git clone --depth=1 "https://github.com/mongodb-labs/drivers-evergreen-tools.git" "${DRIVERS_TOOLS}"
+  git clone --depth=1 --branch NODE-6636 "https://github.com/mongodb-labs/drivers-evergreen-tools.git" "${DRIVERS_TOOLS}"
 fi
 
 echo "installed DRIVERS_TOOLS from commit $(git -C "${DRIVERS_TOOLS}" rev-parse HEAD)"