Version and dependency changes for 1.1.0a3 release

[chiatt]

Updates version number and locks front-end dependencies at arches alpha/7.6.0a1

Corresponding branches:

• arches https://github.com/archesproject/arches/tree/alpha/7.6.0a1

• arches-dev-dependencies https://github.com/archesproject/arches-dev-dependencies/tree/alpha/7.6.0a1