Update BuildKit for cache key memory usage patch

[mikejholly]

Updates BK for memory usage fixes in earthly/buildkit#33

[mikejholly]

Note: I ran the repro case for issue #2957 and did not encounter the error.

date > my-file; earthly-dev +foo & earthly-dev +foo

[vladaionescu]

Intended change?

[mikejholly]

Yes, but I'm not sure why these lines were leading to this failure: https://github.com/earthly/earthly/actions/runs/7023739400/job/19112169282

./e/bazel+build *failed* | --> expandargs readlink -f ./bazel-out
./e/bazel+build *failed* | [no output]
./e/bazel+build *failed* | ERROR examples/bazel/Earthfile line 33:4
./e/bazel+build *failed* |       The command
./e/bazel+build *failed* |           expandargs readlink -f ./bazel-out
./e/bazel+build *failed* |       did not complete successfully. Exit code 1

[vladaionescu]

Perhaps we should just remove this example altogether. It's not very polished anyway.

[mikejholly]

Either or. The target seems to work without that CACHE command.

[vladaionescu]

Yeah.. well the CACHE was the most important point of the example.

[mikejholly]

Ok, I can look into it further.

[alexcb]

I gave this some some more stress testing; by running:

VERSION 0.7

test1:
  FROM alpine:3.17
  COPY my-file .
  RUN true
  RUN md5sum my-file > data
  SAVE ARTIFACT data data

test2:
  FROM alpine:3.17
  COPY my-file .
  RUN true

test3:
  FROM alpine:3.17
  COPY +test1/data .
  RUN cat data

test4:
  FROM +test3
  IF ls data
    BUILD +test1
  END

all:
  BUILD +test1
  BUILD +test2
  BUILD +test3
  BUILD +test4

along with

for i in $(seq 1 100); do /home/alex/gh/earthly/earthly/build/linux/amd64/earthly +all & done

and another process periodically changing the contents of my-file:

while sleep 0.1; do uuidgen > my-file; done

and didn't see any solver issues, so I'm feeling less worried about this change :)

[mikejholly]

@alexcb Cool. Thanks for doing that. I've also been running our Core tests against this branch with no apparent issues. https://github.com/earthly/earthly/actions/runs/7024593005?pr=3505