[gnumeric] python: use /usr/bin/python3 in hash-bang lines.

[Morten Welinder <mortenw src gnome org>]

commit 7e3a82db39a783eca989684306163e6888392aa3
Author: Morten Welinder <terra gnome org>
Date:   Sun Aug 30 13:24:28 2020 -0400

    python: use /usr/bin/python3 in hash-bang lines.

 test/t3000-introspection-basic.py     | 2 +-
 test/t3001-introspection-simple.py    | 2 +-
 test/t3002-introspection-io.py        | 2 +-
 test/t3003-introspection-plugins.py   | 2 +-
 test/t3004-introspection-overrides.py | 2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/test/t3000-introspection-basic.py b/test/t3000-introspection-basic.py
index 74c361dad..16f52ee3c 100755
--- a/test/t3000-introspection-basic.py
+++ b/test/t3000-introspection-basic.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -----------------------------------------------------------------------------
 
 import gi
diff --git a/test/t3001-introspection-simple.py b/test/t3001-introspection-simple.py
index cf517238c..04ace1e27 100755
--- a/test/t3001-introspection-simple.py
+++ b/test/t3001-introspection-simple.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -----------------------------------------------------------------------------
 
 import gi
diff --git a/test/t3002-introspection-io.py b/test/t3002-introspection-io.py
index 7ae8b61b2..e0ca40be6 100755
--- a/test/t3002-introspection-io.py
+++ b/test/t3002-introspection-io.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -----------------------------------------------------------------------------
 
 import gi
diff --git a/test/t3003-introspection-plugins.py b/test/t3003-introspection-plugins.py
index a66bbb790..28a69acb8 100755
--- a/test/t3003-introspection-plugins.py
+++ b/test/t3003-introspection-plugins.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -----------------------------------------------------------------------------
 
 import gi
diff --git a/test/t3004-introspection-overrides.py b/test/t3004-introspection-overrides.py
index a8000812a..460947b7a 100755
--- a/test/t3004-introspection-overrides.py
+++ b/test/t3004-introspection-overrides.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -----------------------------------------------------------------------------
 
 import gi