Slot not reactive when using $$props (regression)

[halfnelson]

Describe the bug
changes in $$props no longer causes a slot to re-render even if the slot has properties that derive from $$props.

To Reproduce
Simple reflection of props fails in 3.7.1
https://svelte.dev/repl/43683d712ec940d7adbddb358106b0ee?version=3.7.1

Expected behavior
when you click the button the text should change from "hi" to "changed" like it does in 3.6.1
https://svelte.dev/repl/43683d712ec940d7adbddb358106b0ee?version=3.6.1

I think this was caused by same refactor as #3354
in that $$props is not seen as dynamic (it is added the dynamic attributes, but skipped when considering the slot redraw)

Severity
I have worked around it by introducing a reactive variable like:
$: p = $$props and referencing that in the slot
e.g. https://svelte.dev/repl/83a137e2188c430884d19ccfb311b14d?version=3.7.1

[StephenStrickland]

Reproducible issue persists in v3.16.4: https://svelte.dev/repl/43683d712ec940d7adbddb358106b0ee?version=3.16.4

[Conduitry]

Fixed in 3.24.1 - https://svelte.dev/repl/43683d712ec940d7adbddb358106b0ee?version=3.24.1