main: move the EF Core and Npgsql floors to 11.0.0 when Npgsql's provider ships it #533

Problem

v11.0.0 can't be tagged while the EF packages depend on a prerelease: a stable package with a prerelease dependency fails the pack with NU5104. On 2026-11-11 Npgsql.EntityFrameworkCore.PostgreSQL and its NodaTime plugin are at 11.0.0-rc.3, and rc.3 pins EF Core to exactly 11.0.0-rc.3.26522.148.

Blocked by

Npgsql.EntityFrameworkCore.PostgreSQL 11.0.0 and Npgsql.EntityFrameworkCore.PostgreSQL.NodaTime 11.0.0 on nuget.org. The provider's 10.0.0 came eleven days after .NET 10.

Change

• Npgsql's provider and its NodaTime plugin to 11.0.0 in the two EF packages, and Microsoft.EntityFrameworkCore.Design to 11.0.0 in the test projects, in one change. Never floor EF Core above the version the floored Npgsql pins.
• Check which Npgsql version the provider resolves. rc.3 still resolves 10.0.3. If 11.0.0 brings Npgsql 11, run the temporal store rule (TemporalStoreParityTests) and the infinity-disabled project before anything else.
• Run every suite on PostgreSQL 16 and 18, both smoke modes, and the four behaviour changes of build: retarget main to .NET 11 for 11.0.0-preview.1 #292 once more.
• Read the provider's 11.0.0 release notes for changes after rc.3. Fix NodaTime LocalDate subtraction and BCE year extraction npgsql/efcore.pg#4109 changed NodaTime LocalDate subtraction for 11.0 only.

Done when

main restores with no prerelease package in the shipping projects, and the full run is green.