Update dependency connectivity to v3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
connectivity (source)	dependencies	major	^2.0.2 → ^3.0.0

---

Release Notes

flutter/plugins (connectivity)

v3.0.6

Compare Source

v3.0.4

Compare Source

v3.0.3

Compare Source

v3.0.2

Compare Source

v3.0.1

Compare Source

v3.0.0

Compare Source

---

Configuration

📅 Schedule: (UTC)

• Branch creation
  • At any time (no schedule defined)
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: pubspec.lock

Command failed: flutter pub upgrade connectivity
The current Dart SDK version is 2.10.5.

Because flutter_new_instagram depends on connectivity >=3.0.0-nullsafety.1 which requires SDK version >=2.12.0-0 <3.0.0, version solving failed.
pub upgrade failed (1; Because flutter_new_instagram depends on connectivity >=3.0.0-nullsafety.1 which requires SDK version >=2.12.0-0 <3.0.0, version solving failed.)