Bump actions/checkout from 2 to 4 (#164)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/checks.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout source
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Lint markdown
         uses: avto-dev/markdown-lint@v1
         with:
@@ -20,6 +20,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout source
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Run Python Ampersands Script
         run: python3 scripts/check_ampersands.py

.github/workflows/refresh-journal-lists.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: gautamkrishnar/keepalive-workflow@v2
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
       - run: wget https://raw.github.com/jrnold/jabref-econ-journal-abbrevs/master/aea-abbrevs.txt -O journals/journal_abbreviations_aea.txt
       - run: pip install pandas
@@ -31,7 +31,7 @@ jobs:
     name: Update Astronomy
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
       - run: wget https://raw.githubusercontent.com/timstaley/jabref-astro-abbreviations/master/MNRAS_abbreviations.txt -O journals/journal_abbreviations_astronomy.txt
       - run: pip install pandas
@@ -47,7 +47,7 @@ jobs:
     name: Update MathSciNet
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
       - run: pip install pandas
       - run: python scripts/update_mathscinet.py
@@ -61,7 +61,7 @@ jobs:
     name: Update UBC
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
       - run: pip install beautifulsoup4 requests
       - run: python scripts/update_ubc.py