cleanup: remove some unused variables #130

Job	Run time
fetch-version / fetch-version	21s
build-dev-packages-arm64 / build-modern-bpf-skeleton	2m 56s
build-dev-packages / build-modern-bpf-skeleton	2m 42s
build-dev-packages-arm64 / build-wasm-package	0s
build-dev-packages-arm64 / build-musl-package	0s
build-dev-packages / build-musl-package	51m 29s
build-dev-packages / build-wasm-package	9m 5s
build-dev-packages / build-packages	49m 50s
build-dev-packages-arm64 / build-packages	41m 25s
test-dev-packages-arm64 / test-packages	2m 31s
test-dev-packages / test-packages	2m 20s
test-dev-packages (static) / test-packages	2m 0s
publish-dev-packages / publish-packages-deb	5m 13s
publish-dev-packages / publish-packages	5m 11s
build-dev-docker-arm64 / build-docker	7m 53s
build-dev-docker / build-docker	5m 54s
publish-dev-docker / publish-docker	6m 39s
	3h 15m 29s

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