bump hatchet default python

Author: CaseyFaist

spec/hatchet/python_spec.rb

@@ -4,7 +4,7 @@
   it "🐍" do
     Hatchet::Runner.new('python-getting-started', stack: DEFAULT_STACK).deploy do |app|
       expect(app.output).to           match(/Installing pip/)
-      expect(app.run('python -V')).to match(/3.6.8/)
+      expect(app.run('python -V')).to match(/3.6.9/)
     end
   end
 end