CI: Use checkout v3 for erlang < 20.3, and v4 for newer ones

actions/checkout@v4 updated from node16 to node20,
which requires a recent GLIBC 2.27 or 2.28,
however some old erlang container images include too old GLIBC

.github/workflows/ci.yml

@@ -14,7 +14,10 @@ jobs:
     container:
       image: erlang:${{ matrix.otp }}
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
+      if: matrix.otp < '20.3'
+    - uses: actions/checkout@v4
+      if: matrix.otp >= '20.3'
     - run: rebar3 compile
     - run: rebar3 xref
     - run: rebar3 dialyzer

.github/workflows/hexpm-release.yml

@@ -12,7 +12,7 @@ jobs:
       image: erlang:26
     steps:
       - name: Check out
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Setup rebar3 hex
         run: |