Prepare for 1.10.9 (pydantic#6034)

Prepare for v2.0b2 (pydantic#5986)

Prepare for Beta 1 release (pydantic#5969)

remove sponsors from docs (pydantic#5833)

Bump version to 2.0a4 (pydantic#5704)

Revert "feat: allow accessing attributes as strings (pydantic#5501)" (p…

…ydantic#5541)

This reverts commit 2451548.

remove os from lint job matrix

prepare for 1.10.7 (pydantic#5248)

prepare for v1.10.6 (pydantic#5157)