### What this PR does / why we need it?
If users run bash format.sh with `git bash` on windows system, there
exists `Executable /bin/bash not found` error. This is because in
Windows Git Bash environment, the Bash executable is actually located at
`/usr/bin/bash`, while the `/bin` directory may not exist, or may be
just an empty directory or a broken symlink that does not contain bash.
### Does this PR introduce _any_ user-facing change?
None
### How was this patch tested?
With this PR and `pre-commit` installed, windows coders can directly run
`bash format.sh` to clean lint issues.
- vLLM version: v0.15.0
- vLLM main:
9562912cea
Signed-off-by: whx-sjtu <2952154980@qq.com>
e2175d9c7e