MinimumRequirements: fix macOS 26 typo

I think this actually intended to say macOS 15 at the time, but now we
have macOS 26 builders!

Change-Id: I6a6a636cacea06ac991ccc4b81ab8a77b775225a
Reviewed-on: https://go-review.googlesource.com/c/wiki/+/755100
Auto-Submit: Michael Pratt <mpratt@google.com>
Commit-Queue: Michael Pratt <mpratt@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

MinimumRequirements.md

diff --git a/MinimumRequirements.md b/MinimumRequirements.md
index 6180b09..68d948b 100644
--- a/MinimumRequirements.md
+++ b/MinimumRequirements.md
@@ -36,7 +36,7 @@
 
 Go 1.25 and later only support macOS 12 Monterey or newer; see https://go.dev/doc/go1.25#darwin.
 
-We have builders for macOS 12 through macOS 16 as of 2026-02-18.
+We have builders for macOS 12 through macOS 26 as of 2026-03-10.
 
 ### [OpenBSD](OpenBSD)