Update the workflows to check out from forks correctly.

Update based on [this response](actions/checkout#551 (comment)).
This may not work for private repos.

.github/workflows/ci.yml

@@ -31,6 +31,7 @@ jobs:
       - uses: actions/checkout@v3
         with:
           ref: ${{ github.event.pull_request.head.ref }}
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
           token: ${{ secrets.GITHUB_TOKEN }}
           fetch-depth: 0
 
@@ -85,6 +86,7 @@ jobs:
         if: github.event.pull_request.head.repo.full_name == github.repository
         with:
           ref: ${{ github.event.pull_request.head.ref }}
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
           token: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
           fetch-depth: 0
 
@@ -131,6 +133,7 @@ jobs:
         if: github.event.pull_request.head.repo.full_name == github.repository
         with:
           ref: ${{ github.event.pull_request.head.ref }}
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
           token: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
           fetch-depth: 0
 
@@ -236,6 +239,7 @@ jobs:
       - uses: actions/checkout@v3
         with:
           ref: ${{ github.event.pull_request.head.ref }}
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
           token: ${{ secrets.GITHUB_TOKEN }}
           fetch-depth: 0
 
@@ -259,6 +263,7 @@ jobs:
       - uses: actions/checkout@v3
         with:
           ref: ${{ github.event.pull_request.head.ref }}
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
           token: ${{ secrets.GITHUB_TOKEN }}
           fetch-depth: 0
 
@@ -283,6 +288,7 @@ jobs:
       - uses: actions/checkout@v3
         with:
           ref: ${{ github.event.pull_request.head.ref }}
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
           token: ${{ secrets.GITHUB_TOKEN }}
           fetch-depth: 0