Remove unnecessary ufmt install in github actions (#2583)

Summary:
Pull Request resolved: #2583

The line `pip install -r requirements-fmt.txt` above already installs `ufmt`, so this is not needed.

Reviewed By: saitcakmak

Differential Revision: D64517856

fbshipit-source-id: 1e2d1ccb7f40000b3c7d686791e6add9511764da

Author: Balandat

.github/workflows/lint.yml

@@ -25,7 +25,6 @@ jobs:
       run: |
         # pin dependencies to match Meta-internal versions
         pip install -r requirements-fmt.txt
-        pip install ufmt
     - name: ufmt
       run: |
         ufmt diff .