Roll io.netty:netty-tcnative-boringssl-static back to 2.0.48.Final

2.0.49.Final removed the .so files from the artifact, so
our tests do not pass against the latest release.

See netty/netty-tcnative#716

JAVA-4488

Author: jyemin

build.gradle

@@ -45,7 +45,7 @@ ext {
     configDir = new File(rootDir, 'config')
     jnrUnixsocketVersion = '0.38.13'
     nettyVersion = '4.1.75.Final'
-    nettyTcnativeBoringsslVersion = '2.0.51.Final'
+    nettyTcnativeBoringsslVersion = '2.0.48.Final'
     snappyVersion = '1.1.8.4'
     zstdVersion = '1.5.0-4'
     mongoCryptVersion = '1.4.0-alpha0'