ci(dependabot): use public registries (#204)

Use public registries for updating dependencies via dependabot. This is
a public repository, so it does not include dependencies from private
registries.

Author: pmlanger

.github/dependabot.yml

@@ -1,21 +1,5 @@
 version: 2
 
-registries:
-  ecr-docker:
-    type: docker-registry
-    url: https://567716553783.dkr.ecr.us-east-1.amazonaws.com
-    username: ${{secrets.ECR_AWS_ACCESS_KEY_ID}}
-    password: ${{secrets.ECR_AWS_SECRET_ACCESS_KEY}}
-  npm-github:
-    type: npm-registry
-    url: https://npm.pkg.github.com
-    token: ${{ secrets.GH_TOKEN }}
-  git-github:
-    type: git
-    url: https://github.com
-    username: x-access-token
-    password: '${{ secrets.GH_TOKEN }}'
-
 updates:
   - package-ecosystem: npm
     schedule:
@@ -29,9 +13,6 @@ updates:
       - "/"
     commit-message:
       prefix: fix(dependabot)
-    registries:
-      - npm-github
-      - git-github
 
   - package-ecosystem: github-actions
     schedule:
@@ -47,8 +28,6 @@ updates:
       - "/"
     commit-message:
       prefix: fix(dependabot)
-    registries:
-      - git-github
 
   - package-ecosystem: docker
     schedule:
@@ -62,5 +41,3 @@ updates:
       - "/"
     commit-message:
       prefix: fix(dependabot)
-    registries:
-      - ecr-docker