CI: Update GitHub actions environments and used actions

Updates the used actions to their latest versions, and update the images to the -latest tags.

This currently means Ubuntu will use 20.04 LTS (and soon 22.04 LTS) and macOS will use macOS 12.

Also adds a workflow_dispatch trigger to the main workflow (the others already have it).

.github/workflows/macos.yml

@@ -10,11 +10,12 @@ on:
     branches:
       - dev
   workflow_dispatch:
+
 jobs:
   build:
-    runs-on: macos-11
+    runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Install dependencies
         run: |
            date -u
@@ -91,7 +92,7 @@ jobs:
             "ARTIFACT_FILE: ${ARTIFACT_FILE}" \
             "PUBLISH_NAME: ${PUBLISH_NAME}"
           exit
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v3
         with:
           name: ${{env.ARTIFACT_FILE}}
           path: ${{env.ARTIFACT_PATH}}