[DEPS #4522, #4548] Fix import api failed to handle email username with upper cases

[pkong-ds]

Blocked by

• #4522
• #4568

What's in this PR?

Fix a bug where if

• authgear.yaml has username/email.case_sensitive=false

then

• import username/email with uppercase with fail

Question

On 2nd thought, maybe the expected behavior is to skip these invalid uppercase imports and show error message?

[pkong-ds]

@louischan-oursky updated, thanks!

[pkong-ds]

@louischan-oursky local CI pass now, thanks!