build: bump max_rss of test-unit to 3_000_000_000

error: memory usage peaked at 2.74GB (2744430592 bytes), exceeding the declared upper bound of 2.70GB (2700000000 bytes)

build.zig

@@ -622,7 +622,7 @@ pub fn build(b: *std.Build) !void {
         .use_llvm = use_llvm,
         .use_lld = use_llvm,
         .zig_lib_dir = b.path("lib"),
-        .max_rss = 2_700_000_000,
+        .max_rss = 3_000_000_000,
     });
     if (link_libc) {
         unit_tests.root_module.link_libc = true;