[ci] Use /usr/bin/env for improved compatibility

ci/check_all_toolchains_tested.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -eo pipefail
 
 # Check whether the set of toolchains tested in this file (other than

ci/check_fmt.sh

@@ -1,3 +1,3 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -eo pipefail
 rustfmt --check $(find . -iname '*.rs' -type f -not -path './target/*')

ci/check_job_dependencies.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -eo pipefail
 which yq > /dev/null
 jobs=$(for i in $(find .github -iname '*.yaml' -or -iname '*.yml')

ci/check_msrv.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -eo pipefail
 
 # Usage: msrv <crate-name>

ci/check_readme.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -eo pipefail
 
 # Install again in case the installation failed during the

ci/check_versions.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -eo pipefail
 
 # Usage: version <crate-name>

githooks/pre-push

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -eo pipefail
 ./ci/check_fmt.sh
 ./ci/check_job_dependencies.sh