[Lint] Adapt lint tools for windows (#6727)

### 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>

tools/actionlint.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 #
 # Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.

tools/check_repo.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 #
 # Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.

tools/collect_user_first_contribution.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 #
 # Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.

tools/install_flash_infer_attention_score_ops_a2.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 #
 # Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.

tools/install_flash_infer_attention_score_ops_a3.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 #
 # Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.

tools/mooncake_installer.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 #
 # Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.

tools/mypy.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 #
 # Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.

tools/png-lint.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 #
 # Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.

tools/shellcheck.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 #
 # Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.

tools/sphinx-lint.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 #
 # Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.