build.zig.zon: bump minimum_zig_version

It probably makes sense for this to be a full release rather than a
patch release where possible. The actual motivation here is that
mlugg/setup-zig currently uses this version exactly. In fact, for `-dev`
versions, I don't think it even *can* do anything else, since there may
be breaking changes between `0.A.0-dev+...` and `0.A.0`.

Author: mlugg

build.zig.zon

@@ -6,7 +6,7 @@
     .fingerprint = 0xcfa933f86ca0a1dd,
     .paths = .{""},
 
-    .minimum_zig_version = "0.14.0-dev.3451+d8d2aa9af",
+    .minimum_zig_version = "0.14.0",
     .dependencies = .{
         .doctest = .{
             .url = "git+https://github.com/ziglang/doctest#0a55c7013461841ec34394c8d08749f5973706da",