Roll buildroot to pick up revert of debugging gen_snapshot prints (flutter/engine#56175)

Changes since last roll

```
3f1a1f0 Revert "For --time'd failed gn_run_binary.py runs repeat failed command (flutter#910)" (flutter#914)
e256f5c Remove github actions from buildroot (flutter#913)
```

Author: aam

DEPS

@@ -264,7 +264,7 @@ allowed_hosts = [
 ]
 
 deps = {
-  'src': 'https://github.com/flutter/buildroot.git' + '@' + 'c8f93f25a19cefaaeb64d4323e2fc8c9ccd20479',
+  'src': 'https://github.com/flutter/buildroot.git' + '@' + '3f1a1f0b26c22a3de5ffe0d3a081397550a12185',
 
   'src/flutter/third_party/depot_tools':
   Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '580b4ff3f5cd0dcaa2eacda28cefe0f45320e8f7',

engine/src/flutter/ci/licenses_golden/excluded_files

@@ -1,7 +1,6 @@
 ../../../.clang-format
 ../../../.git
 ../../../.gitattributes
-../../../.github
 ../../../.gitignore
 ../../../.gn
 ../../../AUTHORS