[Pupeteer] AWS Lambda EROFS in .cache

Currently when I'm trying to run the export server with AWS Lambda using the new enhancement/pupeteer branch, the generation of graph fails because it's trying to create a folder in `/var/task/node_modules/highcharts-export-server/.cache`

The AWS Lambda function is running with node18.x runtime and with the latest highcharts version. package.json version has been fixed as so:
`"highcharts-export-server": "github:highcharts/node-export-server#2a5d8df3d1e2f0b11a7984c55501507fd70d78a6"` which has been suggested as the latest PR simplifies using it as a node module.

#### Expected behaviour
A very nice graph through AWS Lambda

#### Actual behaviour
Error message:
```
{
"errorType":"Error",
"errorMessage":"EROFS: read-only file system, mkdir '/var/task/node_modules/highcharts-export-server/.cache'",
"trace":[
"Error: EROFS: read-only file system, mkdir '/var/task/node_modules/highcharts-export-server/.cache'",
" at mkdirSync (node:fs:1398:3)",
" at checkCache (file:///var/task/node_modules/highcharts-export-server/lib/cache.js:219:29)",
" at Object.initPool (file:///var/task/node_modules/highcharts-export-server/lib/index.js:57:11)",
" at process.processTicksAndRejections (node:internal/process/task_queues:95:5)",
" at async createGraph (file:///var/task/functions/coingecko/chartGraph.mjs:13568:3)",
" at async Runtime.getSparkline [as handler] (file:///var/task/functions/coingecko/chartGraph.mjs:13650:17)"
]
}
```