chore(workflows/build): use ubuntu-22.04

Segfault caused by ubuntu-24.04 image update. Switch back to ubuntu-22.04.

See also:

- actions/runner-images#11471

.github/workflows/build.yml

@@ -44,7 +44,7 @@ jobs:
   build-sdist:
     name: Build sdist
     if: github.repository == 'metaopt/optree' && (github.event_name != 'push' || startsWith(github.ref, 'refs/tags/'))
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     timeout-minutes: 15
     steps:
       - name: Checkout
@@ -90,7 +90,7 @@ jobs:
     needs: [build-sdist]
     strategy:
       matrix:
-        runner: [ubuntu-latest, windows-latest, macos-latest]
+        runner: [ubuntu-22.04, windows-latest, macos-latest]
         python-version:
           - "3.8"
           - "3.9"
@@ -111,16 +111,16 @@ jobs:
           # Windows
           - "ARM64"
         exclude:
-          - runner: ubuntu-latest
+          - runner: ubuntu-22.04
             python-version: "pypy-3.9"
             archs: "ppc64le"
-          - runner: ubuntu-latest
+          - runner: ubuntu-22.04
             python-version: "pypy-3.10"
             archs: "ppc64le"
-          - runner: ubuntu-latest
+          - runner: ubuntu-22.04
             python-version: "pypy-3.9"
             archs: "s390x"
-          - runner: ubuntu-latest
+          - runner: ubuntu-22.04
             python-version: "pypy-3.10"
             archs: "s390x"
           - runner: windows-latest
@@ -134,7 +134,7 @@ jobs:
             archs: "ARM64"
 
           # Exclude archs of other platforms
-          - runner: ubuntu-latest
+          - runner: ubuntu-22.04
             archs: "ARM64"
           - runner: windows-latest
             archs: "aarch64"
@@ -227,7 +227,7 @@ jobs:
   list-artifacts:
     name: List artifacts
     if: github.repository == 'metaopt/optree' && (github.event_name != 'push' || startsWith(github.ref, 'refs/tags/'))
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     needs: [build-sdist, build-wheels]
     timeout-minutes: 15
     steps:
@@ -257,7 +257,7 @@ jobs:
           if-no-files-found: error
 
   publish:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     needs: [list-artifacts]
     if: |
       github.repository == 'metaopt/optree' && github.event_name != 'pull_request' &&

.github/workflows/tests-with-pydebug.yml

@@ -68,7 +68,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Set up pyenv
+      - name: Set up pyenv (Unix)
         id: setup-pyenv-unix
         if: runner.os != 'Windows'
         run: |
@@ -94,7 +94,7 @@ jobs:
             brew install --only-dependencies python@3
           fi
 
-      - name: Set up pyenv
+      - name: Set up pyenv (Windows)
         id: setup-pyenv-windows
         if: runner.os == 'Windows'
         shell: pwsh