chore: Bump HBase to 2.6.3

[adwk67]

Part of stackabletech/docker-images#1269
Tested with hbase-hdfs-cycling demo.

stackable@hbase-master-default-0 /stackable/hbase-2.6.3-stackable0.0.0-dev $ bin/hbase shell
HBase Shell
Use "help" to get list of supported commands.
Use "exit" to quit this interactive shell.
For Reference, please visit: http://hbase.apache.org/2.0/book.html#shell
Version 2.6.3-stackable0.0.0-dev, rUnknown, Thu Oct  2 12:19:48 UTC 2025
Took 0.0011 seconds                                                                                                                                                                                             
hbase:001:0> list
TABLE                                                                                                                                                                                                           
cycling-tripdata                                                                                                                                                                                                
1 row(s)
Took 0.7408 seconds                                                                                                                                                                                             
=> ["cycling-tripdata"]
hbase:002:0> count "cycling-tripdata"
Current count: 1000, row: 02FD41C2518CCF81                                                                                                                                                                      
...                  
Current count: 84000, row: FDBD9EC46964C103                                                                                                                                                                     
84777 row(s)
Took 2.4224 seconds                                                                                                                                                                                             
=> 84777
hbase:003:0> 

[maltesander]

LGTM!