Add renovate.json #1887

Job	Run time
Bzlmod examples (replay)	53s
Bzlmod examples (libFuzzer)	34s
Brief fuzz test runs (C++) (asan-libfuzzer, //examples:empty_fuzz_test_run)	35s
Brief fuzz test runs (C++) (asan-libfuzzer, //examples:re2_fuzz_test_run)	1m 31s
Coverage gathering (C++)	1m 20s
Brief fuzz test runs (C++) (msan-libfuzzer, //examples:empty_fuzz_test_run)	34s
Brief fuzz test runs (Java) (jazzer, //examples/java:EmptyFuzzTest_run)	1m 8s
Brief fuzz test runs (C++) (asan-honggfuzz, //examples:empty_fuzz_test_run)	42s
Brief fuzz test runs (Java) (asan-jazzer, //examples/java:EmptyFuzzTest_run)	55s
Regression tests (C++) (asan-replay)	1m 11s
Brief fuzz test runs (C++) (asan-honggfuzz, //examples:re2_fuzz_test_run)	1m 30s
Regression tests (C++) (asan-libfuzzer)	1m 8s
Regression tests (GCC)	1m 16s
Regression tests (C++) (asan-honggfuzz)	1m 15s
Regression tests (Java) (jazzer)	1m 15s
Regression tests (Java) (asan-jazzer)	53s
Regression tests (macOS)	2m 21s
All unit tests	1m 52s
	20m 53s

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