fix: use flatbuffer@e646392

Signed-off-by: Cocoa <i@uwucocoa.moe>

Author: cocoa-xu

.github/workflows/linux-precompile.yml

@@ -122,6 +122,7 @@ jobs:
 
           git clone https://github.com/google/flatbuffers.git
           cd flatbuffers/
+          git checkout e6463926479bd6b330cbcf673f7e917803fd5831 
           cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release
           make
           sudo make install