chore: remove unused @angular/animations dependency

[cmgchess]

What kind of change does this PR introduce? (check one with "x")

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

What is the current behavior? (You can also link to an open issue here)
@angular/animations is listed as an explicit dependency in the root package.json and as a peer dependency in the library's package.json, but is not used anywhere in the library. It is also deprecated.

What is the new behavior?
@angular/animations is removed from both the root package.json and the library's projects/swimlane/ngx-graph/package.json peer dependencies, along with yarn.lock.

Does this PR introduce a breaking change? (check one with "x")

• Yes
• No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

Other information:
yarn why @angular/animations confirms no other package depends on it transitively.
package-lock.json was not modified as this project uses yarn as its package manager. It was unclear whether it needed to be updated as well. Open to guidance on this.
fix #635

[cmgchess]

hi @steveblue
any feedback on this?