test: use new member limits for basic example

[toddgiguere]

Description

The minimum values required for read-only-replica for MySQL has changed, updated the basic example to reflect these new limits, which is also part of the unit test.

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[toddgiguere]

/run pipeline

[toddgiguere]

The PR test does not run the TestRunBasicExample test that I'm trying to fix here, so I ran it manually and it has passed.

--- PASS: TestRunBasicExample (1349.00s)
PASS
ok  	github.com/terraform-ibm-modules/terraform-ibm-icd-mysql	1351.447s

[terraform-ibm-modules-ops]

🎉 This PR is included in version 1.4.0 🎉

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