fix(test): stick tree-sitter-cpp fixture grammar to a specific hash

It's needed to fix tests fail: https://github.com/tree-sitter/tree-sitter-cpp/pull/202#issuecomment-1546279646

See CLI xtask notes in https://github.com/tree-sitter/tree-sitter/issues/1223

cli/benches/benchmark.rs

@@ -104,6 +104,7 @@ fn main() {
 
             parse(&path, max_path_length, |source| {
                 Query::new(language, str::from_utf8(source).unwrap())
+                    .with_context(|| format!("Query file path: {path:?}"))
                     .expect("Failed to parse query");
             });
         }

script/fetch-fixtures

@@ -23,7 +23,7 @@ fetch_grammar() {
 
 fetch_grammar bash              master
 fetch_grammar c                 master
-fetch_grammar cpp               master
+fetch_grammar cpp               670404d7c689be1c868a46f919ba2a3912f2b7ef
 fetch_grammar embedded-template master
 fetch_grammar go                master
 fetch_grammar html              master

script/fetch-fixtures.cmd

@@ -2,7 +2,7 @@
 
 call:fetch_grammar bash              master
 call:fetch_grammar c                 master
-call:fetch_grammar cpp               master
+call:fetch_grammar cpp               670404d7c689be1c868a46f919ba2a3912f2b7ef
 call:fetch_grammar embedded-template master
 call:fetch_grammar go                master
 call:fetch_grammar html              master