rm extra double quote

Author: Ivansete-status

.github/workflows/codecov.yml

@@ -10,7 +10,7 @@ jobs:
   test:
     name: Test
     env:
-      RUSTFLAGS: -C instrument-coverage -C force-frame-pointers=yes -C no-stack-check"
+      RUSTFLAGS: -C instrument-coverage -C force-frame-pointers=yes -C no-stack-check
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4