build: using zig 0.6.0 will cause a compiler error

[perillo]

A comment in build.zig says:

/// Check the zig version to make sure it can compile the examples properly.
/// This will compile with Zig 0.6.0 and later.

However I tested with zig 0.6.0 and got a compiler error:

const needed_version = std.SemanticVersion.parse("0.11.0-dev.2157") catch unreachable;
                          ^
./build.zig:531:13: note: referenced here
        , .{needed_version});
            ^
/home/manlio/.local/share/sdk/zig/0.6.0/lib/zig/std/special/build_runner.zig:133:24: note: referenced here
        .ErrorUnion => try root.build(builder),
                       ^

I will fix it.