Update RainMachine sensors in parallel

[bachya]

Description:

This PR forces the rainmachine integration to update data for all sensors in parallel.

Related issue (if applicable): N/A

Pull request in home-assistant.io with documentation (if applicable): N/A

Example entry for configuration.yaml (if applicable):

rainmachine:
  controllers:
    - ip_address: !secret rainmachine_ip
      password: !secret rainmachine_password

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.

If the code communicates with devices, web services, or third-party tools:

• New dependencies are only imported inside functions that use them (example).

[MartinHjelmare]

Looks good!

[codecov]

Codecov Report

Merging #23057 into dev will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev   #23057      +/-   ##
==========================================
+ Coverage   93.94%   93.94%   +<.01%     
==========================================
  Files         451      451              
  Lines       36758    36760       +2     
==========================================
+ Hits        34531    34533       +2     
  Misses       2227     2227

Impacted Files	Coverage Δ
homeassistant/components/rainmachine/const.py	100% <100%> (ø)	⬆️

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