Your requirements could not be resolved to an installable set of packages.
Problem 1
- Root composer.json requires symfony/http-client ^4, found symfony/http-client[v4.3.0, ..., v4.4.51] but these were not loaded, because they are affected by security advisories. To ignore the advisories, add ("PKSA-4k7v-pfvw-nqvp") to the audit "ignore" config. To turn the feature off entirely, you can set "block-insecure" to false in your "audit" config.