Make scripts use bash and not sh

sh doesn't have all of the features of bash and was causing problems for
other users. So the scripts use #!/bin/bash now

Bug: b/221232298
Change-Id: I6dd2774ee405e441c1e1400813a1e1b67fa5e73e

commit-msg

diff --git a/commit-msg b/commit-msg
index a9b4e91..e29fdaa 100755
--- a/commit-msg
+++ b/commit-msg
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # From Gerrit Code Review 3.4.0-550-gc960fc8f7d
 #
 # Part of Gerrit Code Review (https://www.gerritcodereview.com/)

pre-commit

diff --git a/pre-commit b/pre-commit
index c63237a..92a1229 100755
--- a/pre-commit
+++ b/pre-commit
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 if [ -x /usr/lib/git-core/google_hook ]; then
   /usr/lib/git-core/google_hook pre-commit "$@"
 else