Use older Github Action runners for wider compatibility (#15)

Realized this while testing on my ubuntu 20.04 machine (they removed
20.04 runners anyway 😢)

Co-authored-by: Ngô Việt Hoài Bảo <baonvh@phenikaa-x.com>
Co-authored-by: Jonathan Frey <jonathanpaulfrey@gmail.com>

Author: 3 people

.github/workflows/main.yml

@@ -10,17 +10,17 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - runs-on: ubuntu-latest
+          - runs-on: ubuntu-22.04
             architecture: linux-amd64
           - runs-on: macos-13
             architecture: osx-amd64
-          - runs-on: windows-latest
+          - runs-on: windows-2019
             architecture: windows-amd64
-          - runs-on: ubuntu-24.04-arm
+          - runs-on: ubuntu-22.04-arm
             architecture: linux-arm64
           - runs-on: windows-11-arm
             architecture: windows-arm64
-          - runs-on: macos-latest
+          - runs-on: macos-15
             architecture: osx-arm64
 
     name: Build on ${{ matrix.architecture }}