Fix nightly ci workflow failures (#915)

* Shorten job names so they'll fit in GitHub's sidebar

* Try ubuntu-22.04 instead of ubuntu-latest

There are not as many Python images for Ubuntu 24 right now as there
are for 22.04.

.github/workflows/nightly.yml

@@ -21,12 +21,12 @@ concurrency:
 
 jobs:
   cirq-stable:
-    name: Test current stable Cirq release
+    name: Stable Cirq release
     runs-on: ${{matrix.os}}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.10.12", "3.11.9", "3.12.8"]
+        os: [ubuntu-22.04, macos-14, windows-latest]
+        python-version: ["3.10.11", "3.11.9", "3.12.8"]
         arch: [x64, arm64]
         exclude:
           - os: windows-latest
@@ -65,7 +65,7 @@ jobs:
           check/pytest
 
   cirq-dev:
-    name: Test latest Cirq pre-release
+    name: Cirq pre-release
     runs-on: ${{matrix.os}}
     strategy:
       matrix: