Changed deprecated method offer to trySend

[ZherebtsovAlexandr]

The documentation says: Deprecated offer method. This method was deprecated in the favour of trySend.

See Kotlin/kotlinx.coroutines#974 for more context.

Changed offer -> trySend in InternalFlowFactory.kt

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[ZherebtsovAlexandr]

Signed CLA @cla-bot check

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Thank you for your pull request and welcome to our community. We could not parse the GitHub identity of the following contributors: Zherebtsov Alexandr.
This is most likely caused by a git client misconfiguration; please make sure to:

1. check if your git client is configured with an email to sign commits git config --list | grep email
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[ZherebtsovAlexandr]

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!