ci: disable dependabot (#35430) #1

Job	Run time
check	0s
cargo-test-sbf (token/program)	7m 20s
test	0s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	13m 52s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	9m 47s
cargo-test-sbf (token-upgrade/program)	8m 13s
cargo-test-sbf (feature-proposal/program)	8m 49s
cargo-test-sbf (governance/addin-mock/program, governance/program)	12m 35s
cargo-test-sbf (memo/program)	7m 8s
cargo-test-sbf (name-service/program)	7m 38s
cargo-test-sbf (stake-pool/program)	10m 31s
cargo-test-sbf (single-pool/program)	7m 53s
	1h 33m 46s

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