Update dependency share_plus to v12

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
share_plus (source)	dependencies	major	^11.0.0 -> 12.0.1

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Release Notes

fluttercommunity/plus_plugins (share_plus)

v12.0.1

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• FIX(share_plus): Avoid crash on iOS 26 on iPhones with no sharePositionOrigin param(#​3699). (42b079bd)

v12.0.0

Compare Source

Note: This release has breaking changes.

On Android plugin now requires the following:

• Android Gradle Plugin >=8.12.1
• Gradle wrapper >=8.13
• Kotlin 2.2.0

• FIX(share_plus): unable to get the correct result on iOS (#​3660). (3bd253b0)
• DOCS(all): replace MacOS by macOS in package READMEs (#​3658). (72b6234c)
• BREAKING FEAT(share_plus): Change Android compile SDK, update Android build config (#​3671). (24363e27)

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