Remove windows-2019 from CI, as it is no longer supported.

Author: sunfishcode

.github/workflows/main.yml

@@ -252,7 +252,7 @@ jobs:
       RUSTFLAGS: --cfg rustix_use_experimental_features
     strategy:
       matrix:
-        build: [ubuntu, ubuntu-22.04, i686-linux, aarch64-linux, powerpc-linux, powerpc64le-linux, riscv64-linux, s390x-linux, arm-linux, ubuntu-stable, i686-linux-stable, aarch64-linux-stable, riscv64-linux-stable, s390x-linux-stable, powerpc-linux-stable, powerpc64le-linux-stable, arm-linux-stable, ubuntu-1.63, i686-linux-1.63, aarch64-linux-1.63, riscv64-linux-1.63, s390x-linux-1.63, powerpc64le-linux, powerpc64le-linux-1.63, arm-linux-1.63, macos-latest, macos-13, windows, windows-2019, musl]
+        build: [ubuntu, ubuntu-22.04, i686-linux, aarch64-linux, powerpc-linux, powerpc64le-linux, riscv64-linux, s390x-linux, arm-linux, ubuntu-stable, i686-linux-stable, aarch64-linux-stable, riscv64-linux-stable, s390x-linux-stable, powerpc-linux-stable, powerpc64le-linux-stable, arm-linux-stable, ubuntu-1.63, i686-linux-1.63, aarch64-linux-1.63, riscv64-linux-1.63, s390x-linux-1.63, powerpc64le-linux, powerpc64le-linux-1.63, arm-linux-1.63, macos-latest, macos-13, windows, musl]
         include:
           - build: ubuntu
             os: ubuntu-latest
@@ -458,9 +458,6 @@ jobs:
           - build: windows
             os: windows-latest
             rust: nightly-2025-06-23
-          - build: windows-2019
-            os: windows-2019
-            rust: nightly-2025-06-23
           - build: musl
             os: ubuntu-latest
             rust: stable