[docs] Update minimum Windows SDK version

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Change-Id: Iad7dffd9f63e0946daab9cd094bfb20aad723b90
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/316835
Auto-Submit: James Price <jrprice@google.com>
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docs/building.md

diff --git a/docs/building.md b/docs/building.md
index 2431aa8..31a1ada 100644
--- a/docs/building.md
+++ b/docs/building.md
@@ -52,7 +52,7 @@
   - CPU:
     - x86-64 (also known as amd64)
     - arm64 support is experimental
-  - Windows SDK 10.0.22621.x or a later version.
+  - Windows SDK 10.0.26100.x or a later version.
   - C++20 compiler:
     - Clang, as provided by GN. This is the primary supported compiler.
     - MSVC 19.41, or Visual Studio 2022 v17.11 or later.