Better validation of the URL used in core HTTP requests.

Merges [30443] to the 3.9 branch.

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Anchor texturize to shortcodes to improve regex efficiency.

For the 3.9 branch; see [30449] for trunk.

props miqrogroove.
see #29557 for segfault issues.

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Validate image data.

Merges [30458] to the 3.9 branch.

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Prevent high resource usage when hashing large passwords. props mdawaffe, pento

Merges [30466] to the 3.9 branch.

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3.9.3 version bumps.

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