remove private docker registries from dependabot #1178

Job	Run time
Resolve Modules	5s
GolangCI Lint (./utils/protobuf/helloworld)	34s
GolangCI Lint (./utils/tracing/integ-tests/client-server/goclient)	29s
GolangCI Lint (./utils/tracing/go)	38s
GolangCI Lint (./utils/storage/go)	32s
GolangCI Lint (./tools/deployer)	19s
GolangCI Lint (./tools/trace-plotter)	41s
GolangCI Lint (./tools/test-client)	29s
GolangCI Lint (./tools/endpoint)	6s
GolangCI Lint (./tools/benchmarking_eventing)	46s
GolangCI Lint (./tools/relay)	44s
GolangCI Lint (./tools/invoker/proto)	24s
GolangCI Lint (./tools/invoker)	37s
GolangCI Lint (./benchmarks/fibonacci)	38s
GolangCI Lint (./benchmarks/chained-function-serving)	53s
GolangCI Lint (./benchmarks/aes/go)	25s
GolangCI Lint (./benchmarks/corral)	58s
GolangCI Lint (./benchmarks/auth/go)	30s
GolangCI Lint (./benchmarks/video-analytics)	57s
GolangCI Lint (./benchmarks/chained-function-eventing)	33s
GolangCI Lint (./benchmarks/gg/benchmarks)	32s
GolangCI Lint (./benchmarks/hotel-app)	46s
	12m 36s

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