[PR #13010/9e00085c backport][3.15] Fix parse_mimetype producing spurious empty-key parameter for whitespace-only segments after semicolons#13097

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patchback/backports/3.15/9e00085c958fbcd40de37867e773bf7cd3bbee0c/pr-13010aio-libs/aiohttp:patchback/backports/3.15/9e00085c958fbcd40de37867e773bf7cd3bbee0c/pr-13010Copy head branch name to clipboard