fix(labeler): fix labeler config file name

[maxcao13]

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Fixes: #696

Description of the change:

Fix labeler config file to be named correctly.

Motivation for the change:

This is because it was named like .labeler.yml when it should be labeler.yml

How to manually test:

Look at maxcao13#4 and notice that the action succeeds.
HOWEVER, I'm not sure if it actually works because it doesn't not apply any labels but I'm not sure if that's because it is on a fork. There are some issues within the action labeler repo that talk about how this doesn't work on forks.

[maxcao13]

Have to override the action then to merge...