Describe the bug

Tests using bootstrap-vue and createLocalVue() output the following warning

[BootstrapVue warn]: Multiple instances of Vue detected!
You may need to set up an alias for Vue in your bundler config.
See: https://bootstrap-vue.org/docs#using-module-bundlers"

Looks like the same issue described in #3303 is back with the 2.21.0 release

Expected behavior

Tests run successfully without warnings.

Versions

Libraries:

• BootstrapVue: 2.21.0
• Bootstrap: 4.5.3
• Vue: 2.6.12
• Jest: 26.6.3

Environment:

Jest