Add dependabot configuration #233

Job	Run time
Verify / ubuntu-latest jdk-17-zulu 3.9.9	2m 18s
Verify / setup-matrix	1s
Verify / ubuntu-latest jdk-17-zulu 3.6.3	1m 18s
Verify / ubuntu-latest jdk-17-zulu 3.9.9	2s
Verify / ubuntu-latest jdk-21-zulu 3.6.3	1m 16s
Verify / ubuntu-latest jdk-21-zulu 3.9.9	1m 19s
Verify / ubuntu-latest jdk-8-zulu 3.6.3	1m 7s
Verify / ubuntu-latest jdk-8-zulu 3.9.9	1m 19s
Verify / windows-latest jdk-17-zulu 3.6.3	2m 26s
Verify / windows-latest jdk-17-zulu 3.9.9	2m 18s
Verify / windows-latest jdk-21-zulu 3.6.3	2m 36s
Verify / windows-latest jdk-21-zulu 3.9.9	2m 23s
Verify / windows-latest jdk-8-zulu 3.6.3	2m 13s
Verify / windows-latest jdk-8-zulu 3.9.9	2m 12s
Verify / macos-latest jdk-17-zulu 3.6.3	1m 5s
Verify / macos-latest jdk-17-zulu 3.9.9	1m 15s
Verify / macos-latest jdk-21-zulu 3.6.3	1m 7s
Verify / macos-latest jdk-21-zulu 3.9.9	1m 3s
Verify / macos-latest jdk-8-zulu 3.6.3	1m 6s
Verify / macos-latest jdk-8-zulu 3.9.9	1m 14s
	29m 38s

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