testCRM: use valid email address in the test

`sender@customer.com <sender@customer.com>` used in the test is not a
valid email address. We have updated to python3.9.20 which comes with a
fix for CVE-2023-27043 and no longer allow this kind of broken addresses.

Replace the address with a similar valid address,
`"sender@customer.com" <sender@customer.com>`, that was probably the
original intention of this test.
31 jobs for for_testrunner_1 in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-Master

02:39:40

passed ERP5.CodingStyleTest-TestRunner1

02:49:36

failed ERP5.PerformanceTest-Master

00:35:37

failed ERP5.PerformanceTest-TestRunner1

00:35:39

failed ERP5.UnitTest-Master

03:46:03

failed ERP5.UnitTest-TestRunner1

02:34:57

passed SlapOS.Eggs.UnitTest-Master.Python2

00:26:16

passed SlapOS.Eggs.UnitTest-Master.Python3

00:36:40

passed Wendelin.UnitTest-Master

00:40:40

passed ERP5.CodingStyleTest-Master

03:20:24

passed ERP5.CodingStyleTest-Master

01:39:06

failed ERP5.PerformanceTest-Master

00:40:15

failed ERP5.UnitTest-Master

03:44:59

failed ERP5.UnitTest-Master

06:58:42

passed SlapOS.Eggs.UnitTest-Master.Python2

00:30:31

passed SlapOS.Eggs.UnitTest-Master.Python2

00:37:13

passed SlapOS.Eggs.UnitTest-Master.Python2

00:23:40

passed SlapOS.Eggs.UnitTest-Master.Python2

00:23:36

passed SlapOS.Eggs.UnitTest-Master.Python3

00:25:06

passed SlapOS.Eggs.UnitTest-Master.Python3

00:24:17

passed SlapOS.Eggs.UnitTest-Master.Python3

00:43:55

passed SlapOS.Eggs.UnitTest-Master.Python3

00:40:24

passed Wendelin.UnitTest-Master

00:50:23

failed Wendelin.UnitTest-Master

01:09:52

passed Wendelin.UnitTest-Master

00:40:39

passed Wendelin.UnitTest-Master

00:45:51

passed Wendelin.UnitTest-Master

00:42:10

failed Wendelin.UnitTest-Master

00:53:26

passed Wendelin.UnitTest-Master

00:36:40

passed Wendelin.UnitTest-Master

00:48:28

failed Wendelin.UnitTest-Master

00:39:33