Upgrade to stac-fastapi v2.5.5

[jonhealy1]

Related Issue(s):

• 230

• 238

Description:

Upgrade stac-fastapi libraries to v2.5.5

PR Checklist:

• [x] Code is formatted and linted (run pre-commit run --all-files)
• [x] Tests pass (run make test)
• [x] Documentation has been updated to reflect changes, if applicable
• [x] Changes are added to the changelog

[jonhealy1]

I don't know why the collections extension test broke?