[ci] Move all runners to ubuntu-latest

Author: serge-sans-paille

.github/workflows/cmake.yml

@@ -8,7 +8,7 @@ defaults:
     shell: bash -l {0}
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
     - name: Checkout xsimd
       uses: actions/checkout@v3

.github/workflows/cross-rvv.yml

@@ -7,7 +7,7 @@ env:
   GCC_VERSION: "12"
 jobs:
   build:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     name: 'RISC-V RVV${{ matrix.vector_bits }}'
     strategy:
       matrix:

.github/workflows/cross-sve.yml

@@ -5,7 +5,7 @@ concurrency:
   cancel-in-progress: true
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     name: 'Arm SVE${{ matrix.vector_bits }}'
     strategy:
       matrix:

.github/workflows/emulated.yml

@@ -8,7 +8,7 @@ defaults:
     shell: bash -l {0}
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     name: '${{ matrix.sys.compiler }} ${{ matrix.sys.version }} - emulated'
     strategy:
       matrix:

.github/workflows/linux.yml

@@ -8,7 +8,7 @@ defaults:
     shell: bash -l {0}
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     name: '${{ matrix.sys.compiler }} ${{ matrix.sys.version }} - ${{ matrix.sys.flags }}'
     strategy:
       matrix: