Merge pull request #111 from jonsequitur/fix-110

fix #110

Merge pull request #108 from jonsequitur/fix-extension-loading-and-add-secret-management

update System.CommandLine to beta5

cleanup, update .NET Interactive version

Merge pull request #107 from jonsequitur/fix-extension-loading-and-add-secret-management

update test baseline

fix extension loading, add support for secret management

update some metadata-related details and tests

fix #103

package updates

update to .NET 9

Set roll-forward policy to `LatestMajor` for the global tool.

update packages including fix for #90

update package versions