Update emsdk version from 9308e6ad to 926b6837 (emscripten-core#27406)

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

emsdk version updated: 9308e6ad => 926b6837

The following revisions were included in this update:

```
- 926b6837 Roll llvm-project from f2a284b4732b to 074568806993 (31 revisions)
- 196097cc Roll binaryen from acf302c4ea3b to 355863c2168e (2 revisions)
- 9e8722df Roll binaryen from 108e796b9b04 to acf302c4ea3b (1 revision)
- 6b4afe90 Roll llvm-project from 9d2000c24d7b to f2a284b4732b (50 revisions)
- b53037c6 Roll emscripten from 6d8b2c1 to c43384e (1 revision)
- c76518a9 Roll llvm-project from 6f47123da420 to 9d2000c24d7b (47 revisions)
- 98d1f201 Roll llvm-project from 9925bcf8d945 to 6f47123da420 (38 revisions)
```

Full log:
https://chromium.googlesource.com/emscripten-releases/+log/9308e6ad..926b6837

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

```
codesize/test_codesize_cxx_mangle.json: 262045 => 262056 [+11 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": 23258,
   "a.out.js.gz": 9134,
-  "a.out.nodebug.wasm": 238787,
-  "a.out.nodebug.wasm.gz": 79780,
-  "total": 262045,
-  "total_gz": 88914,
+  "a.out.nodebug.wasm": 238798,
+  "a.out.nodebug.wasm.gz": 79782,
+  "total": 262056,
+  "total_gz": 88916,
   "sent": [
     "__cxa_begin_catch",
     "__cxa_end_catch",

test/emsdk_version.txt

@@ -1 +1 @@
-9308e6ad5ffcd7cd7a5cb52cdb68e969960fc27c
+926b6837225890c3761acd192785128bd5e55a61