chore: add Dependabot configuration

[jawnsy]

No description provided.

[codecov]

Codecov Report

Merging #97 (c6adb6d) into main (ed387a5) will increase coverage by 2.86%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
+ Coverage   69.15%   72.01%   +2.86%     
==========================================
  Files          84       89       +5     
  Lines        3404     3627     +223     
  Branches       55       55              
==========================================
+ Hits         2354     2612     +258     
+ Misses        859      795      -64     
- Partials      191      220      +29     

Flag	Coverage Δ
unittest-go-macos-latest	67.96% <ø> (+0.41%)	⬆️
unittest-go-ubuntu-latest	70.12% <ø> (?)
unittest-go-windows-latest	67.69% <ø> (?)
unittest-js	78.30% <ø> (ø)

Impacted Files	Coverage Δ
peerbroker/listen.go	82.40% <0.00%> (-2.40%)	⬇️
provisioner/terraform/parse.go	75.00% <0.00%> (ø)
coderd/userpassword/userpassword.go	63.41% <0.00%> (ø)
provisioner/terraform/serve.go	66.66% <0.00%> (ø)
provisioner/terraform/provision.go	57.62% <0.00%> (ø)
database/postgres/postgres.go	70.00% <0.00%> (ø)
peer/channel.go	84.75% <0.00%> (+1.82%)	⬆️
peer/conn.go	76.82% <0.00%> (+2.34%)	⬆️
peerbroker/dial.go	80.95% <0.00%> (+4.76%)	⬆️
coderd/coderdtest/coderdtest.go	100.00% <0.00%> (+22.64%)	⬆️
... and 2 more

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[kylecarbs]

Awesome! The CI jank is my bad, fixing in the other PR!