Duplicate '.bmp' key in mimetypes.py, maps to both 'image/bmp' and 'image/x-ms-bmp'

[3d6f9085-2ec4-4475-85f9-d7f9841df54e]

BPO	44211
Nosy	@terryjreedy, @bitdancer, @serhiy-storchaka, @zooba, @andreasjansson
PRs	python/cpython#26300

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields: ```python assignee = None closed_at = None created_at = labels = ['type-bug', 'library', '3.9', '3.10', '3.11'] title = "Duplicate '.bmp' key in mimetypes.py, maps to both 'image/bmp' and 'image/x-ms-bmp'" updated_at = user = 'https://github.com/andreasjansson' ``` bugs.python.org fields: ```python activity = actor = 'serhiy.storchaka' assignee = 'none' closed = False closed_date = None closer = None components = ['Library (Lib)'] creation = creator = 'andreasjansson' dependencies = [] files = [] hgrepos = [] issue_num = 44211 keywords = ['patch'] message_count = 4.0 messages = ['394157', '394679', '401630', '402038'] nosy_count = 5.0 nosy_names = ['terry.reedy', 'r.david.murray', 'serhiy.storchaka', 'steve.dower', 'andreasjansson'] pr_nums = ['26300'] priority = 'normal' resolution = None stage = 'patch review' status = 'open' superseder = None type = 'behavior' url = 'https://bugs.python.org/issue44211' versions = ['Python 3.9', 'Python 3.10', 'Python 3.11'] ```

[3d6f9085-2ec4-4475-85f9-d7f9841df54e]

The mime type of .bmp was changed from image/x-ms-bmp in https://github.com/python/cpython/pull/4756.

https://github.com/python/cpython/pull/3062 then re-introduced image/x-ms-bmp while keeping the newer image/bmp mapping.

[terryjreedy]

David and Steve merged the seemingly conflicting PRs.

[serhiy-storchaka]

Since this change has a user-visible effect a NEWS entry is required. Just copy it from bpo-22589.

[serhiy-storchaka]

It is not clear whether we want to backport this change.

[furkanonder]

@serhiy-storchaka Issue seems to resolved. We can close the issue.