Ensure we always encode all data in JdkZlibEncoder. (netty#8305)

Motivation:

In theory our estimation of the needed buffer could be off and so we need to ensure we grow it if there is no space left.

Modifications:

Ensure we grow the buffer if there is no space left in there but we still have data to deflate.

Result:

Correctly deflate data in all cases.

codec/src/main/java/io/netty/handler/codec/compression/JdkZlibEncoder.java

@@ -225,8 +225,18 @@ protected void encode(ChannelHandlerContext ctx, ByteBuf uncompressed, ByteBuf o
         }
 
         deflater.setInput(inAry, offset, len);
-        while (!deflater.needsInput()) {
+        for (;;) {
             deflate(out);
+            if (deflater.needsInput()) {
+                // Consumed everything
+                break;
+            } else {
+                if (!out.isWritable()) {
+                    // We did not consume everything but the buffer is not writable anymore. Increase the capacity to
+                    // make more room.
+                    out.ensureWritable(out.writerIndex());
+                }
+            }
         }
     }