chore: added dependabot configuration

[Veer0x1]

What this PR does / why we need it:
Added a dependabot config file to update dependencies

Which issue(s) this PR fixes (optional, in Fixes #<issue number>, #<issue number>, ... format, will close the issue(s) when PR gets merged):
Fixes #2225

Checklist:

• Docs included if any changes are user facing

[google-oss-prow]

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[coveralls]

Pull Request Test Coverage Report for Build 12461917611

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 12449807365:	0.0%
Covered Lines:	85
Relevant Lines:	85

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💛 - Coveralls

[kannon92]

See #2225 (comment).

@tenzen-y do you still want to hold on dependabot integration until v1 api is removed?

[tenzen-y]

See #2225 (comment).

@tenzen-y do you still want to hold on dependabot integration until v1 api is removed?

Yes, I want to block this until v1 removal. Just FYI, we will release the final v1 API version within this year or early Jan.
After that, we will remove the v1 API from the master branch (the v1 is still supported in the release branch).

/hold