Mise à jour des librairies vulnérables

# npm audit report

browserify-sign  2.6.0 - 4.2.1
Severity: high
browserify-sign upper bound check issue in `dsaVerify` leads to a signature forgery attack - https://github.com/advisories/GHSA-x9w5-v3q2-3rhw
fix available via `npm audit fix`
node_modules/meteor-node-stubs/node_modules/browserify-sign

follow-redirects  <=1.15.5
Severity: moderate
follow-redirects' Proxy-Authorization header kept across hosts - https://github.com/advisories/GHSA-cxjh-pqwp-8mfp
fix available via `npm audit fix`
node_modules/follow-redirects

2 vulnerabilities (1 moderate, 1 high)