build(deps): bump external/bpf_conformance from `9fdacf6` to `b1b1c21` in the actions group

[dependabot[bot]]

Bumps the actions group with 1 update: external/bpf_conformance.

Updates external/bpf_conformance from 9fdacf6 to b1b1c21

Commits

• b1b1c21 Bump ubuntu in /Docker/Linux in the actions group (#327)
• b0086f4 Bump ubuntu in /Docker/Linux in the actions group (#323)
• 665cc29 Add step to upload build output to diagnose failures (#326)
• e80df99 Add test cases for INTMIN and -1 (#325)
• 830859d Bump windows/nanoserver from b1c10aa to cdd5a33 in /Docker/Windows (#321)
• 982d4a2 Enable merge_group trigger (#324)
• See full diff in compare view

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[coveralls]

coverage: 79.637%. remained the same when pulling cad09e0dccaea5f89d0b44567455ca6688e1f81f on dependabot/submodules/actions-6aca31f6cf into 0642da65e09c6a05d1c52e0365652afb0877dcac on main.

[dependabot[bot]]

Looks like external/bpf_conformance is updatable in another way, so this is no longer needed.