Remove redundant bash directive.

Author: kklein

.github/workflows/ci.yaml

@@ -1,10 +1,6 @@
 name: CI
 on: [push]
 
-defaults:
-  run:
-    shell: bash -el {0}
-
 jobs:
 
   pre-commit-checks:

.github/workflows/update_grammar.yml

@@ -9,9 +9,6 @@ jobs:
     update-grammar:
         name: Update TSQL grammar based on antlr4's grammar
         runs-on: ubuntu-latest
-        defaults:
-          run:
-            shell: bash -el {0}
         steps:
             - name: Checkout branch
               uses: actions/checkout@v4