chore(NODE-4593): fix mongosh integration tests (#3387)

Author: addaleax

.evergreen/config.yml

@@ -1682,7 +1682,7 @@ tasks:
     commands:
       - func: install dependencies
         vars:
-          NODE_LTS_NAME: fermium
+          NODE_LTS_NAME: gallium
       - func: run mongosh integration tests
   - name: run-custom-snappy-tests
     tags:

.evergreen/generate_evergreen_tasks.js

@@ -483,7 +483,7 @@ SINGLETON_TASKS.push({
     {
       func: 'install dependencies',
       vars: {
-        NODE_LTS_NAME: 'fermium'
+        NODE_LTS_NAME: 'gallium'
       }
     },
     { func: 'run mongosh integration tests' }

.evergreen/run-mongosh-integration-tests.sh

@@ -4,7 +4,14 @@ set -o xtrace   # Write all commands first to stderr
 
 source "${PROJECT_DIRECTORY}/.evergreen/init-nvm.sh"
 
+npm cache clear --force || true
+npm i -g [email protected] || true
+
 npm pack | tee npm-pack.log
+
+npm cache clear --force || true
+npm i -g [email protected] || true
+
 export TARBALL_FILENAME="$(tail -n1 npm-pack.log)"
 cd /tmp
 git clone --depth=10 https://github.com/mongodb-js/mongosh.git