lz4: Update version from 1.8.3 to 1.9.1

From the [releases page][1]:

1.  LZ4 v1.9.0 is a performance focused release, also offering minor API
    updates.

2.  This is a point release, which main objective is to fix a read
    out-of-bound issue reported in the decoder of v1.9.0. Upgrade from
    this version is recommended.  # Please enter the commit message for
    your changes. Lines starting

[1]: https://github.com/lz4/lz4/releases

lz4.be0

@@ -1,6 +1,6 @@
 #!/usr/bin/env beesh
 
-# BEE_VERSION lz4-1.8.3-0
+# BEE_VERSION lz4-1.9.1-0
 
 ## this file was created by bee init and should be executed to build a
 ## bee-package. (Additional hints are located at the end of this file.)