fix: update the version of iOS SDK to address the Privacy Manifest issue

[1abhishekpandey]

Description of the change

• We have updated the minimum iOS SDK version in the Flutter to v1.26.3 to address the following issue:

We've decided to remove the tracking domain URL from the Privacy Manifest file. This change aims to resolve the error that occurs when a request to our tracking domain gets blocked after the user denies tracking permission.
Refer to this PR: rudderlabs/rudder-sdk-ios#509.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Related issues

Fix #1

Checklists

Development

• Lint rules pass locally
• The code changed/added as part of this pull request has been covered with tests
• All tests related to the changed code pass in development

Code review

• This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
• "Ready for review" label attached to the PR and reviewers mentioned in a comment
• Changes have been reviewed by at least one other engineer
• Issue from task tracker has a link to this pull request

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
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See analysis details on SonarCloud