remove apostrophe from comment in Dockerfile #10738

Job	Run time
Fuzz	14m 51s
Unit (macos-14)	3m 33s
Unit (ubuntu-20.04)	3m 17s
Unit (ubuntu-22.04)	3m 22s
Unit (ubuntu-24.04)	7m 37s
Unit (windows-2022)	9m 9s
Protobuf Lint	5s
Up-to-date mocks	2m 35s
Unit (custom-arm64-jammy)	7m 22s
Up-to-date protobuf	16s
Unit (custom-arm64-noble)	7m 7s
e2e	14m 4s
Run bootstrap monitor e2e tests	6m 19s
e2e_existing_network	5m 6s
Up-to-date go.mod and go.sum	17s
Lint	3m 39s
Build Antithesis avalanchego images	10m 3s
Build Antithesis xsvm images	12m 33s
Image build	10m 51s
Upgrade	3m 28s
	2h 5m 34s

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