Remove unused --cfg releasing from CI

Author: Madoshakalaka

.github/workflows/everything.yml

@@ -67,11 +67,7 @@ jobs:
       - name: Run cargo publish --dry-run
         if: github.ref == 'refs/heads/master'
         run: cargo publish --dry-run
-        env:
-          RUSTFLAGS: "--cfg releasing"
 
       - name: Run cargo publish
         if: startsWith(github.ref, 'refs/tags/')
         run: cargo publish --token ${{ secrets.CRATES_IO_TOKEN }}
-        env:
-          RUSTFLAGS: "--cfg releasing"