feat: change license to apache 2.0

[Lash-L]

The remaining contributors in #876 are small contributions that are extra data types, enum values, etc. and are not protected by GPL-3.

We can leave it open to continue to give them a chance to consent, but I do not believe we need to hold off on the license update.

git blame of remaining contributors

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  @pauloruberto — 8 lines, from feat: add mappings for cleaning fluid states (32c717e, #636)

  roborock/data/v1/v1_code_mappings.py:183  class CleanFluidStatus(RoborockDssCodes):
  roborock/data/v1/v1_code_mappings.py:184      """Status of the cleaning fluid container."""
  roborock/data/v1/v1_code_mappings.py:185
  roborock/data/v1/v1_code_mappings.py:186      empty_not_installed = 1
  roborock/data/v1/v1_code_mappings.py:187      okay = 2
  roborock/data/v1/v1_code_mappings.py:188
  roborock/data/v1/v1_code_mappings.py:189
  roborock/data/v1/v1_containers.py:23          CleanFluidStatus,

  @CountGreven — 1 line, from feat: adds code for duct blockage (84dd5fb, #64)

  roborock/data/v1/v1_code_mappings.py:313      duct_blockage = 34

  @Christopher-Masselli — 1 line, from feat: add support for qrevo curv (e42729a, #253)

  roborock/const.py:34  ROBOROCK_QREVO_CURV = "roborock.vacuum.a135"

  @cryptk — 1 line, from fix: changed incorrect s8 pro ultra string (c6a37a9)

  roborock/const.py:47  ROBOROCK_S8_PRO_ULTRA = "roborock.vacuum.a70"

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