chore(deps): upgrade dependency msgspec to ~=0.20.0 (#3009)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

requirements/speed.txt

@@ -1,2 +1,2 @@
-msgspec~=0.19.0
+msgspec~=0.20.0
 aiohttp[speedups]