[mediacapture-main] new commits pushed by alvestrand

The following commits were just pushed by alvestrand to https://github.com/w3c/mediacapture-main:

* Update to latest ReSpec version
  by github-actions[bot]
https://github.com/w3c/mediacapture-main/commit/2d8f173dffad850adf5c640aa56028714e7e8ba9

* Merge pull request #749 from w3c/respec-25.18.3

Update to latest ReSpec version
  by Harald Alvestrand
https://github.com/w3c/mediacapture-main/commit/8bd634e706e0219eeb1e1adae86f6c18f7ff2fa9



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