Update buildkit past ca71a44

[jedevc]

Currently, we are stuck on the current version of buildkit, since moby/buildkit#4347 (comment) seems to have introduced a deadlock.

To reproduce: update buildkit in go.mod to ca71a446d9f4e31ca7c4fa30fb8fb8861b8b0117, and run a large number of integration tests. The engine will lock up after some time - after sending SIGUIT to the engine, you can observe the stack trace:

goroutine 441 [sync.Mutex.Lock, 4 minutes]:
runtime.gopark(0xc01d5ebbf0?, 0xc00aef48e1?, 0xc0?, 0xf?, 0xc017641870?)
	/usr/local/go/src/runtime/proc.go:398 +0xce fp=0xc017641790 sp=0xc017641770 pc=0x43e42e
runtime.goparkunlock(...)
	/usr/local/go/src/runtime/proc.go:404
runtime.semacquire1(0xc01d77eb74, 0x0?, 0x3, 0x1, 0x21?)
	/usr/local/go/src/runtime/sema.go:160 +0x218 fp=0xc0176417f8 sp=0xc017641790 pc=0x44f918
sync.runtime_SemacquireMutex(0xffffffffffffffff?, 0x0?, 0xc00ed7c4b0?)
	/usr/local/go/src/runtime/sema.go:77 +0x25 fp=0xc017641830 sp=0xc0176417f8 pc=0x46d545
sync.(*Mutex).lockSlow(0xc01d77eb70)
	/usr/local/go/src/sync/mutex.go:171 +0x15d fp=0xc017641880 sp=0xc017641830 pc=0x488f1d
sync.(*Mutex).Lock(...)
	/usr/local/go/src/sync/mutex.go:90
github.com/moby/buildkit/util/progress.(*MultiWriter).writeRawProgress(0xc01d77eb70, 0xc004bd6e00)
	/go/pkg/mod/github.com/moby/buildkit@v0.13.0-beta1.0.20231107172820-ca71a446d9f4/util/progress/multiwriter.go:91 +0x5c fp=0xc017641960 sp=0xc017641880 pc=0xcb537c
github.com/moby/buildkit/util/progress.(*MultiWriter).WriteRawProgress(0xc01d77eb70?, 0xc004bd6e00?)
	/go/pkg/mod/github.com/moby/buildkit@v0.13.0-beta1.0.20231107172820-ca71a446d9f4/util/progress/multiwriter.go:87 +0xac fp=0xc017641a28 sp=0xc017641960 pc=0xcb516c
github.com/moby/buildkit/util/progress.(*MultiWriter).writeRawProgress(0xc01dfe5da0, 0xc004bd6e00)
	/go/pkg/mod/github.com/moby/buildkit@v0.13.0-beta1.0.20231107172820-ca71a446d9f4/util/progress/multiwriter.go:95 +0x17e fp=0xc017641b08 sp=0xc017641a28 pc=0xcb549e
github.com/moby/buildkit/util/progress.(*MultiWriter).WriteRawProgress(0xc01dfe5da0?, 0xc004bd6e00?)
	/go/pkg/mod/github.com/moby/buildkit@v0.13.0-beta1.0.20231107172820-ca71a446d9f4/util/progress/multiwriter.go:87 +0xac fp=0xc017641bd0 sp=0xc017641b08 pc=0xcb516c
github.com/moby/buildkit/util/progress.(*MultiWriter).Add(0xc01d77eb70, {0x1f7e8b0?, 0xc01dfe5da0?})
	/go/pkg/mod/github.com/moby/buildkit@v0.13.0-beta1.0.20231107172820-ca71a446d9f4/util/progress/multiwriter.go:46 +0x190 fp=0xc017641c60 sp=0xc017641bd0 pc=0xcb4d70
github.com/moby/buildkit/solver.(*state).setEdge(0xc01dfe3440, 0x2, 0xc003975a40, 0xc0165fcb40)
	/go/pkg/mod/github.com/moby/buildkit@v0.13.0-beta1.0.20231107172820-ca71a446d9f4/solver/jobs.go:178 +0x370 fp=0xc017641ce8 sp=0xc017641c60 pc=0xdef3f0
github.com/moby/buildkit/solver.(*Solver).setEdge(0xc0007071a0, {0xc003975a40?, {0x1f92360?, 0xc004bd6480?}}, 0xc003975a40)
	/go/pkg/mod/github.com/moby/buildkit@v0.13.0-beta1.0.20231107172820-ca71a446d9f4/solver/jobs.go:295 +0x125 fp=0xc017641d58 sp=0xc017641ce8 pc=0xdf0265
github.com/moby/buildkit/solver.(*scheduler).dispatch(0xc0002fc770, 0xc01356a140)
	/go/pkg/mod/github.com/moby/buildkit@v0.13.0-beta1.0.20231107172820-ca71a446d9f4/solver/scheduler.go:177 +0xbdb fp=0xc017641f68 sp=0xc017641d58 pc=0xdfe87b
github.com/moby/buildkit/solver.(*scheduler).loop(0xc0002fc770)
	/go/pkg/mod/github.com/moby/buildkit@v0.13.0-beta1.0.20231107172820-ca71a446d9f4/solver/scheduler.go:104 +0x1d4 fp=0xc017641fc8 sp=0xc017641f68 pc=0xdfdb34
github.com/moby/buildkit/solver.newScheduler.func1()
	/go/pkg/mod/github.com/moby/buildkit@v0.13.0-beta1.0.20231107172820-ca71a446d9f4/solver/scheduler.go:35 +0x25 fp=0xc017641fe0 sp=0xc017641fc8 pc=0xdfd865
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1650 +0x1 fp=0xc017641fe8 sp=0xc017641fe0 pc=0x4715e1
created by github.com/moby/buildkit/solver.newScheduler in goroutine 1
	/go/pkg/mod/github.com/moby/buildkit@v0.13.0-beta1.0.20231107172820-ca71a446d9f4/solver/scheduler.go:35 +0x22d

See #6169 for more information on when this was originally discovered.

Next steps:

• Wait until upstream PRs are merged 🎉

[jedevc]

The fix for this was reverted in #6458.