alphabet-compliance: Change password hashing algorithm to sha512

BUG=b/196055702
TEST=`cat /etc/pam.d/system-auth | grep sha512` && manual testing
RELEASE_NOTE=None

Change-Id: I313fd14a1433f6ba1062df8aafba32285058b663
diff --git a/alphabet-compliance/scripts/5340-set-password-hashing-algorithm.sh b/alphabet-compliance/scripts/5340-set-password-hashing-algorithm.sh
index e7da5fb..4ac3a37 100644
--- a/alphabet-compliance/scripts/5340-set-password-hashing-algorithm.sh
+++ b/alphabet-compliance/scripts/5340-set-password-hashing-algorithm.sh
@@ -14,4 +14,4 @@
 # limitations under the License.
 
 ## Section: 5.3.4 Ensure password hashing algorithm is SHA-512 (Not Scored) ##
-sed -i '/password/s/md5/sha2/' /etc/pam.d/system-auth
+sed -i '/password/s/md5/sha512/' /etc/pam.d/system-auth