Bump aiohttp to 3.7.3

[bdraco]

Proposed change

Currently blocked as zero byte file serving regressed again. Fixed in aio-libs/aiohttp#5380

Bump aiohttp to 3.7.3

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[bdraco]

3.7.2 re-regressed 0 bytes files again.

[frenck]

I've seen I opened the same PR. Any reason to block/draft?

[bdraco]

aio-libs/aiohttp#5157 regressed aio-libs/aiohttp#5125. It looks like my test wasn't good enough to catch it.

[bdraco]

Closing this since it was updated in #45180.

The zero byte file issue still exists, but I'm not sure its actually a problem. I've sent a PR upstream aio-libs/aiohttp#5380 and we can update again once its fixed.