Fix CI/CD

The versions of the containers we were running are ancient.

This change brings them up to modernity once more.

Author: lhchavez

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   ci:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
 
     steps:
       - uses: actions/checkout@v2
@@ -32,7 +32,7 @@ jobs:
         run: cargo doc
 
   nix:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v2
       - uses: actions/cache@v2

.github/workflows/release.yml

@@ -10,8 +10,8 @@ on:
 jobs:
 
   release:
-    # Should match the version that Polygott uses.
-    runs-on: ubuntu-18.04
+    # Should match the version reported by /etc/lsb-release on Repls.
+    runs-on: ubuntu-24.04
 
     steps:
       - uses: actions/checkout@v2