deps: Bump AWSSDK.S3 from 3.7.511.8 to 4.0.102.4

[dependabot]

Pinned AWSSDK.S3 at 4.0.102.4.

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Sourced from AWSSDK.S3's releases.

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[XtremeOwnageDotCom]

Superseded by #54.

This bump can't land on its own: AWS SDK v4 changed ListObjectsV2Response.IsTruncated from bool to bool?, so the S3 import loop stops compiling —

ImportedDocsPlugin.cs(397,22): error CS0019: Operator '&&' cannot be applied to
operands of type 'bool?' and 'bool'

#54 is the same version bump plus that one-line fix, with the full suite green.

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.