fix: dependabot target branch in go-ds-crdt

[gammazero]

Summary

Change dependabot config to target default branch instead of dependency-updates branch.

Why do you need this?

Makes go-ds-crdt consistent will all other IPFS repos.

What else do we need to know?

DRI: myself

Reviewer's Checklist

• It is clear where the request is coming from (if unsure, ask)
• All the automated checks passed
• The YAML changes reflect the summary of the request
• The Terraform plan posted as a comment reflects the summary of the request

[github-actions]

The following access changes will be introduced as a result of applying the plan:

Access Changes

There will be no access changes

[github-actions]

Before merge, verify that all the following plans are correct. They will be applied as-is after the merge.

Terraform plans

ipfs

Terraform used the selected providers to generate the following execution
plan. Resource actions are indicated with the following symbols:
  ~ update in-place

Terraform will perform the following actions:

  # github_repository_file.this["go-ds-crdt/.github/dependabot.yml"] will be updated in-place
  ~ resource "github_repository_file" "this" {
      + commit_author       = "GitHub"
      + commit_email        = "noreply@github.com"
      ~ commit_message      = <<-EOT
          - Upgrade to GitHub-native Dependabot (#96)
          - 
          - Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
          + chore: Update .github/dependabot.yml [skip ci]
        EOT
      ~ content             = <<-EOT
            version: 2
            updates:
              - package-ecosystem: gomod
                directory: "/"
                schedule:
                  interval: weekly
                  time: "11:00"
                open-pull-requests-limit: 10
          -     target-branch: dependency-upgrades
                ignore:
                - dependency-name: github.com/golang/protobuf
                  versions:
                  - 1.5.1
                - dependency-name: github.com/ipfs/go-log/v2
                  versions:
                  - 2.1.2            
              - package-ecosystem: "github-actions"
                directory: "/"
                schedule:
                  interval: "weekly"
        EOT
        id                  = "go-ds-crdt/.github/dependabot.yml"
        # (7 unchanged attributes hidden)
    }

Plan: 0 to add, 1 to change, 0 to destroy.