update std lib to decls being disallowed between fields

lib/std/zig/parser_test.zig

@@ -1,3 +1,18 @@
+test "zig fmt: decl between fields" {
+    try testError(
+        \\const S = struct {
+        \\    const foo = 2;
+        \\    const bar = 2;
+        \\    const baz = 2;
+        \\    a: usize,
+        \\    const foo1 = 2;
+        \\    const bar1 = 2;
+        \\    const baz1 = 2;
+        \\    b: usize,
+        \\};
+    );
+}
+
 test "zig fmt: errdefer with payload" {
     try testCanonical(
         \\pub fn main() anyerror!void {
@@ -2001,11 +2016,11 @@ test "zig fmt: struct declaration" {
         \\    f1: u8,
         \\    f3: u8,
         \\
+        \\    f2: u8,
+        \\
         \\    fn method(self: *Self) Self {
         \\        return self.*;
         \\    }
-        \\
-        \\    f2: u8,
         \\};
         \\
         \\const Ps = packed struct {