Add CVE-2020-11996 to org.apache.tomcat/coyote [adbcurate]

Useful links

• CVE: https://nvd.nist.gov/vuln/detail/CVE-2020-11996

• Solr: https://search.maven.org/solrsearch/select?q=a:%22org.apache.tomcat/coyote

• Mvnrepository: https://mvnrepository.com/artifact/org.apache.tomcat/coyote

To be checked:

• identifier should be the CVE id when it exists.
• description must not contain an overview of the package, fixed versions, affected versions, solution or links. It leverages the Markdown syntax.
• date is the date on which the advisory was made public (or updated).
• urls must contain URLs specific to the vulnerability, not URLs generic to the package itself.
• not_impacted lists old versions that are not impacted, if any, the fixed versions.
• solution tells how to remediate the vulnerability.
• title is a short description. It does not contain the package name.