upgrade grpc to v1.73

[joechenrh]

From v1.66, WithRecvBufferPool has been renamed to WithBufferPool.
Besides, buffer pool is enabled by default. That is, the default buffer pool of client is changed from nopBufferPool to tieredBufferPool.
As this option was introduced in #1132, and not enabled in TiKV, we keep the old logic to use a NopBufferPool as default value.

Why upgrade grpc

Because we are using some expermential API that was already renamed. This will block those libraries that depend on this to use newer version of grpc. (And I found someone has already want to do this: #1672)

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[joechenrh]

/hold

[joechenrh]

/ok-to-test

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[joechenrh]

/unhold

[joechenrh]

/run-all-tests

[joechenrh]

Previously, grpc was upgraded to 1.64 and reverted (by #1369) due to errors in TiFlash regression tests. So I keep using old API DialContext here.

I've ran a test internally with this branch. The plan ID is 7972306, and you can check the result.

rpc error: code = DeadlineExceeded desc = received context error while waiting for new LB policy update: context deadline exceeded
rpc error: code = Unavailable desc = connection error: desc = \"transport: Error while dialing: dial tcp 10.200.86.26:3930: i/o timeout

(Although I suspect that error is not related to grpc API change because it seems like we couldn't connect to 10.200.86.26:3930. That is, the first mistake was the result, and the second mistake was the cause, as resolver didn't provide any address to LB.)

[dveeden]

This would fix #1789, right?