Add Dependabot configuration file #8138

Job	Run time
build-wasm (ubuntu-latest, v2, 2.4.0)	4m 22s
namada-release (ubuntu-latest, 2.4.0, ABCI Release build)	8m 13s
test-unit (ubuntu-latest, nightly-2024-02-10, 2.4.0, ABCI)	18m 12s
test-wasm (ubuntu-latest, v2, nightly-2024-02-10, 2.4.0)	9m 32s
upload-wasm (ubuntu-latest, v2, nightly-2024-02-10, 2.4.0)	26s
test-integration (ubuntu-latest, nightly-2024-02-10, 2.4.0, ABCI)	9m 55s
run-benchmarks (ubuntu-latest, nightly-2024-02-10, 2.4.0, ABCI)	26m 37s
namada-e2e (ubuntu-latest, nightly-2024-02-10, 2.4.0, 0.37.2, 0)	13m 51s
namada-e2e (ubuntu-latest, nightly-2024-02-10, 2.4.0, 0.37.2, 1)	21m 7s
namada-e2e (ubuntu-latest, nightly-2024-02-10, 2.4.0, 0.37.2, 2)	11m 32s
namada-e2e (ubuntu-latest, nightly-2024-02-10, 2.4.0, 0.37.2, 3)	13m 4s
namada-e2e (ubuntu-latest, nightly-2024-02-10, 2.4.0, 0.37.2, 4)	16m 23s
namada-e2e (ubuntu-latest, nightly-2024-02-10, 2.4.0, 0.37.2, 5)	17m 31s
	2h 50m 45s

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