Updated locked dependencies

[cpswan]

Is your feature request related to a problem? Please describe.

As sshnoports and sshnp_flutter are not published packages we include pubspec.lock in this repo, which reflects a snapshot in time for the transitive dependencies.

Dependabot should alert us to any security vulnerabilities for specific versions in pubspec.lock, but will not propose changes to pubspec.yaml where we use ^ (which we do a lot).

This became problematic (#1246) with pinenacl 0.5.1 not working with Dart 3.5.0. The unit tests against noports_core were fixed with an upstream bump (atsign-foundation/dartssh2#3) to 0.6.0 but there were residual problems with pubspec.lock in sshnoports remaining pinned to 0.5.1

Describe the solution you'd like

Bump pubspec.lock files with dart pub upgrade and introduce a process to periodically review and test changes to transitive dependencies.

Describe alternatives you've considered

If we stop using ^ in the pubspec.yaml then we'll get much more frequent bumps to that, which will result in a progressive march of changes to pubspec.lock

Additional context

#1254 attempted to solve an instance of problems related to this by introducing additional dependency overrides to pubspec.yaml