Update pinned version for yeoman-environment

[ricardo-espinoza]

This change updates yeoman-environment package version from 2.9.6 to 2.10.3, back to the configuration used in the QDK version 0.14.2011120240.

Some notes about this change:

• This update is being done as a fix for issue VSCode: Creating first Q# project fails #848 .
• This issue originated from a change in QDK 0.15.2101125897, in which this package was downgraded to 2.9.6 to mitigate an npm audit failure. See issue Update npm packages for VS Code extension with npm audit #806 for details.
• The original audit failure was tracked to axios@0.18.1, however, this has been fixed as of axios@0.21.1.
• At this point it's safe to restore yeoman-environment to 2.10.3 since the npm audit doesn't fail with the updated axios and the npm dependency is no longer present.

Thanks @cgranade for the analysis of this issue.