Fix timeout for auto update integration tests

[vapopov]

In this PR extended timeout for integration autoupdate test TestUpdate mentioned in #47915
Average CI/CD execution time of TestUpdate right now is ~29sec, which might easily exceed current timeout in 30sec

-race flag adds a lot of overhead for this specific tests, in local run difference

=== RUN   TestUpdate
2024/10/25 03:55:00 Calculating and serving file checksum: /tmp/updater4001372424/teleport-v1.2.3-linux-arm64-bin.tar.gz
Update progress: [▒▒▒▒▒▒▒▒▒▒] (Ctrl-C to cancel update)
2024/10/25 03:55:01 Calculating and serving file checksum: /tmp/updater4001372424/teleport-v3.2.1-linux-arm64-bin.tar.gz
--- PASS: TestUpdate (2.14s)

with -race flag:

=== RUN   TestUpdate
2024/10/25 03:59:55 Calculating and serving file checksum: /tmp/updater2983531478/teleport-v1.2.3-linux-arm64-bin.tar.gz
Update progress: [▒▒▒▒▒▒▒▒▒▒] (Ctrl-C to cancel update)
2024/10/25 04:00:14 Calculating and serving file checksum: /tmp/updater2983531478/teleport-v3.2.1-linux-arm64-bin.tar.gz
--- PASS: TestUpdate (19.52s)

Results of running go test . -v -count 300 -race -timeout 0

PASS
ok  	github.com/gravitational/teleport/integration/autoupdate/tools	17350.623s

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