Fixes to reflect changes in ClinVar submission schema & maintenance

[2.4]

Changed

• Updated version of external images in GitHub actions
• Updated API submission schema to the latest
• Demo variant to take care of "Somatic mutation" no longer available among Mode of inheritance choices
• clinicalSignificance.clinicalSignificanceDescription value extracted from Clinical significance or Germline classification column
• clinicalSignificance.comment values extracted from Comment on clinical significance or Comment on classification column

Fixed

• Bump certifi from 2022.12.7 to 2023.7.22
• Description of the response returned by dry run endpoint in README file
• Migrate from deprecated pkg_resources lib to importlib_resources
• Updated python-multipart from 0.0.5 to 0.0.7 to address security alert by dependabot