Automatic rebaseline of codesize expectations. NFC (#26833)

This is an automatic change generated by
tools/maint/rebaseline_tests.py.

The following (1) test expectation files were updated by
running the tests with `--rebaseline`:

```
codesize/test_codesize_cxx_mangle.json: 262247 => 262245 [-2 bytes / -0.00%]

Average change: -0.00% (-0.00% - -0.00%)
```

Co-authored-by: emscripten-bot <emscripten-bot@users.noreply.github.com>

Author: emscripten-bot

test/codesize/test_codesize_cxx_mangle.json

@@ -1,10 +1,10 @@
 {
   "a.out.js": 23290,
   "a.out.js.gz": 8999,
-  "a.out.nodebug.wasm": 238957,
-  "a.out.nodebug.wasm.gz": 79820,
-  "total": 262247,
-  "total_gz": 88819,
+  "a.out.nodebug.wasm": 238955,
+  "a.out.nodebug.wasm.gz": 79818,
+  "total": 262245,
+  "total_gz": 88817,
   "sent": [
     "__cxa_begin_catch",
     "__cxa_end_catch",