version bumps for `v0.6.0`

[GitGab19]

Similar to #487

[GitGab19]

#553 is bumping:

• stratum-apps from 0.5.0 to 0.6.0
• jd_client_sv2 from 0.3.0 to 0.4.0
• translator_sv2 from 0.3.0 to 0.4.0

[plebhash]

#575 is bumping:

• pool_sv2 from 0.4.0 to 0.5.0

[plebhash]

#548 is bumping:

• bitcoin_core_sv2 from 0.3.0 to 0.4.0
• jd_server_sv2 from 0.3.0 to 0.4.0