TT#124273 GitHub actions: update steps to latest actions

Quoting annotations/deprecation notes from GitHub actions (see e.g.
https://github.com/sipwise/rtpengine/actions/runs/3995067348):

| Node.js 12 actions are deprecated. Please update the following actions to use Node.js 16: actions/checkout@v2, actions/upload-artifact@v2.
| For more information see: https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/.

Also see https://github.com/actions/upload-artifact +
https://github.com/actions/checkout for our related actions.

Change-Id: Ic2c26a8e617241063a63f02ca073d77a93853bc6

.github/workflows/coverity.yml

@@ -20,7 +20,7 @@ jobs:
       COVERITY_SCAN_NOTIFICATION_EMAIL: development@sipwise.com
     steps:
       - name: Checkout source
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Update APT cache
         run: |

.github/workflows/debpkg.yml

@@ -13,19 +13,19 @@ jobs:
 
     steps:
     - name: Checkout source
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Execute Docker debpkg action
       uses: ./.github/actions/debpkg-bullseye
 
     - name: Store Debian package artifacts
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v3
       with:
         name: Debian binary package files
         path: '*.deb'
 
     - name: Store Debian package build info
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v3
       with:
         name: Debian buildinfo file
         path: '*.buildinfo'
@@ -36,19 +36,19 @@ jobs:
 
     steps:
     - name: Checkout source
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Execute Docker debpkg action
       uses: ./.github/actions/debpkg-sid
 
     - name: Store Debian package artifacts
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v3
       with:
         name: Debian binary package files
         path: '*.deb'
 
     - name: Store Debian package build info
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v3
       with:
         name: Debian buildinfo file
         path: '*.buildinfo'

.github/workflows/shellcheck.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
     - name: Checkout source
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Display original shellcheck version
       run: shellcheck --version

.github/workflows/unit-tests.yml

@@ -13,7 +13,7 @@ jobs:
 
     steps:
       - name: Checkout source
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Update APT cache
         run: |