Update dependencies to fix security vulnerabilities reported by Snyk

[Holubinka]

Hi,

While using spectaql@3.0.4, we ran a snyk test and found security vulnerabilities introduced via transitive dependencies.

Predictable Value Range from Previous Values [Critical Severity][https://security.snyk.io/vuln/SNYK-JS-FORMDATA-10841150] in form-data@2.5.3
introduced by spectaql@3.0.4 > sync-request@6.1.0 > then-request@6.0.2 > form-data@2.5.3

Improper Handling of Unexpected Data Type [Medium Severity][https://security.snyk.io/vuln/SNYK-JS-ONHEADERS-10773729] in on-headers@1.0.2
introduced by spectaql@3.0.4 > grunt-contrib-connect@5.0.1 > morgan@1.10.0 > on-headers@1.0.2 

Would you consider updating or replacing the affected dependencies to eliminate these vulnerabilities?

Thanks for developing spectaql!