fix(firestore, windows): fix compilation issue on Windows

[Lyokone]

Description

Replace this paragraph with a description of what this PR is doing. If you're modifying existing behavior, describe the existing behavior, how this PR is changing it, and what motivated the change.

Related Issues

closes #12359

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• I read the Contributor Guide and followed the process outlined there for submitting PRs.
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Breaking Change

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[SPiercer]

Thanks it works, i tried your changes locally and worked on the example app testing on my app now

[SPiercer]

Changes Worked on my device and in my app LGTM

[SPiercer]

@russellwheatley or @exaby73 can someone approve and merge those please we're severely blocked and we need to have a release soon

[mesalih]

I've test it locally on my device and does resolves the issue.

[PolaraPrince]

This change has helped me, so I am grateful.

[BirjuVachhani]

This fixes the issue on windows. I can confirm.

[SPiercer]

@exaby73 we're blocked by you man if you can see this please act.

[SPiercer]

@Lyokone How long usually PR stay until it gets merged?

[russellwheatley]

@SPiercer - It won't be released until next week now. You can update your pubspec.yaml to depend on git master branch if you cannot wait.

[SPiercer]

@russellwheatley that's what I'm saying, it's not merged to master yet.

or do you mean depend on the fix branch?

[Aravind556]

Issue fixed.Thank You