Bump JasperFx 1.28.2 to fix List<T> duplicate-field codegen (closes #3702)

[jeremydmiller]

Summary

• Bumps JasperFx 1.28.1 → 1.28.2.
• 1.28.2 ships a CodeFormatter.Write fix (Emit safe C# for enum constants in CodeFormatter.Write jasperfx#197) that emits safe C# for any enum value — including bit-OR'd combinations on non-[Flags] enums like Npgsql.NpgsqlDbType.
• Adds the reproduction test from @elexisvenator's bug: Adding a DuplicateField/Index to a List<T> column generates invalid code. #3702 verbatim. With the upstream fix it passes unchanged.

Why this supersedes #3702

A document with

[DuplicateField(DbType = NpgsqlDbType.Array | NpgsqlDbType.Text,
                PgType = "text[]", IndexMethod = IndexMethod.gin)]
public List<string> ListOfStrings { get; set; }

caused Marten codegen to emit:

parameter0.NpgsqlDbType = NpgsqlTypes.NpgsqlDbType.-2147483629;

— an Enum.ToString() of an undefined enum value yielding an integer literal. Roslyn rejected it (CS1001 Identifier expected).

#3702 patched two call sites in UpsertArgument.cs. The root cause was actually in JasperFx's CodeFormatter.Write, which used value.GetType().FullNameInCode() + "." + value (implicit ToString()) for every enum. Fixing it there handles every other call-site too — past and future.

The 1.28.2 fix:

• Defined single member ⇒ Type.Name (unchanged)
• [Flags] combo ⇒ Type.A | Type.B
• Any other value (incl. non-Flags bit-OR'd values) ⇒ ((Type)(rawIntegerLiteral))

Closes #3702. Anne — er, Ben Edwards (@elexisvenator) — kept as co-author on the reproduction test.

Test plan

• dotnet test src/DocumentDbTests --filter Bug_PR_3702 -f net9.0 passes locally
• Full CI green

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