python/*: Switch /bin/sh back to /bin/bash

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

python/et_xmlfile/et_xmlfile.SlackBuild

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # Slackware build script for et_xmlfile
 

python/python3-openpyxl/python3-openpyxl.SlackBuild

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # Slackware build script for python3-openpyxl
 

python/python3-patsy/python3-patsy.SlackBuild

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # Slackware build script for python3-patsy
 

python/python3-seaborn/python3-seaborn.SlackBuild

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # Slackware build script for python3-seaborn
 

python/python3-statsmodels/python3-statsmodels.SlackBuild

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # Slackware build script for python3-statsmodels