Update java version in BUILD.md
PR <https://github.com/Genymobile/scrcpy/pull/2064>
@@ -64,7 +64,7 @@ sudo apt install gcc git pkg-config meson ninja-build \
libsdl2-dev
# server build dependencies
-sudo apt install openjdk-8-jdk
+sudo apt install openjdk-11-jdk
```
On old versions (like Ubuntu 16.04), `meson` is too old. In that case, install
