CI: no need to workaround an old git bug

Author: ulysses4ever

.github/workflows/validate.yml

@@ -74,10 +74,6 @@ jobs:
           ghc-version: ${{ matrix.ghc }}
           cabal-version: '3.10.1.0'
 
-      - name: Work around git problem https://bugs.launchpad.net/ubuntu/+source/git/+bug/1993586 (cabal PR #8546)
-        run: |
-          git config --global protocol.file.allow always
-
       # The '+exe' constraint below is important, otherwise cabal-install
       # might decide to build the library but not the executable which is
       # what we need.
@@ -240,10 +236,6 @@ jobs:
           ghc --version
           cabal update
 
-      - name: Work around git problem https://bugs.launchpad.net/ubuntu/+source/git/+bug/1993586 (cabal PR #8546)
-        run: |
-          git config --global protocol.file.allow always
-
       # The '+exe' constraint below is important, otherwise cabal-install
       # might decide to build the library but not the executable which is
       # what we need.