submodule: bump openthread from `b8f036a` to `ee83d45`

[dependabot[bot]]

Bumps openthread from b8f036a to ee83d45.

Commits

• ee83d45 [cli] add br pd omrprefix command to display DHCPv6 PD OMR prefix (#10147)
• 922059c [dataset] simplify dataset manager MGMT_SET request handling (#10139)
• d8e3e83 [dataset] simplify SendSetRequest (#10135)
• 485cb18 [dataset] add ValidateTlvs(), helper methods, and unit test (#10111)
• See full diff in compare view

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