Firestore build warnings

[paulb777]

Description

- WARN  | xcodebuild:  FirebaseFirestoreInternal/Firestore/core/src/local/index_backfiller.cc:61:48: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'int' [-Wshorten-64-to-32]
- WARN  | xcodebuild:  FirebaseFirestoreInternal/Firestore/core/src/local/index_backfiller.cc:64:36: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'int' [-Wshorten-64-to-32]
- WARN  | xcodebuild:  FirebaseFirestoreInternal/Firestore/core/src/remote/bloom_filter.cc:81:10: warning: implicit conversion loses integer precision: 'uint64_t' (aka 'unsigned long long') to 'int32_t' (aka 'int') [-Wshorten-64-to-32]

Reproducing the issue

Build and check warnings

Firebase SDK Version

10.23.0

Xcode Version

15.3

Installation Method

CocoaPods

Firebase Product(s)

Firestore

Targeted Platforms

iOS

Relevant Log Output

No response

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[cherylEnkidu]

I will create a quick fix PR.

[cherylEnkidu]

#12536