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Queries using versions now use a serialization that requires 4.1 #3245

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In #2943, a new serialization of the VersionValue was introduced, though we had to modify it in #3179 so to avoid deserialization problems when serializing and deserializing continuations across 4.0 and 4.1. With 4.2, we want to start using the new serialization path to serialize VersionValue children more completely.

The mixed mode testing in PRB validate this change is compatible with 4.1.9.0. I've also run the full mixed mode battery for the versionsTest tests, and the serialization is compatible between this change and all 4.1 versions, as well as all 4.0 versions after 4.0.562.0, which is in line with what we'd expect.

This resolves #3203.

In FoundationDB#2943, a new serialization of the `VersionValue` was introduced, though we had to modify it in FoundationDB#3179 so to avoid deserialization problems when serializing and deserializing continuations across 4.0 and 4.1. With 4.2, we want to start using the new serialization path to serialize `VersionValue` children more completely.

This also bumps the minor version to 4.2. This resolves FoundationDB#3203.
@alecgrieser alecgrieser added this to the 4.2 milestone Mar 13, 2025
@alecgrieser alecgrieser added the breaking change Changes that are not backwards compatible label Mar 13, 2025
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Switch to new VersionValue serialization
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