CI: Update Github actions to fix errors & warnings

Update Github actions to v4 for checkout and upload-artifact to fix the
following error:

```
This request has been automatically failed because it uses a deprecated version of `actions/upload-artifact: v2`
```

Update microsoft/setup-msbuild actions to v2 to fix the following
warning:

```
The following actions uses node12 which is deprecated and will be forced to run on node16: microsoft/[email protected]
```

.github/workflows/microv.yml

@@ -16,7 +16,7 @@ jobs:
   clang-format:
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         path: microv
 
@@ -48,7 +48,7 @@ jobs:
   build-efi:
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         path: microv
 
@@ -71,7 +71,7 @@ jobs:
         make
       shell: bash
 
-    - uses: actions/upload-artifact@v2
+    - uses: actions/upload-artifact@v4
       with:
         name: microv_efi
         path: |
@@ -80,7 +80,7 @@ jobs:
   build-efi-debug:
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         path: microv
 
@@ -105,7 +105,7 @@ jobs:
         make
       shell: bash
 
-    - uses: actions/upload-artifact@v2
+    - uses: actions/upload-artifact@v4
       with:
         name: microv_efi_debug
         path: |
@@ -114,7 +114,7 @@ jobs:
   build-efi-noeth:
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         path: microv
 
@@ -138,7 +138,7 @@ jobs:
         make
       shell: bash
 
-    - uses: actions/upload-artifact@v2
+    - uses: actions/upload-artifact@v4
       with:
         name: microv_efi_noeth
         path: |
@@ -147,13 +147,13 @@ jobs:
   build-userpace:
     runs-on: windows-2019
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         path: microv
 
     - name: Setup MSBuild (PATH)
       id: setup_msbuild_path
-      uses: microsoft/setup-msbuild@v1.0.2
+      uses: microsoft/setup-msbuild@v2
 
     - name: Setup
       run: |
@@ -175,7 +175,7 @@ jobs:
         & msbuild /p:Configuration=Release /p:Platform=x64 /p:TargetVersion=Windows10 hypervisor.sln
       shell: pwsh
 
-    - uses: actions/upload-artifact@v2
+    - uses: actions/upload-artifact@v4
       with:
         name: microv_userspace
         path: |
@@ -184,13 +184,13 @@ jobs:
   build-userpace-debug:
     runs-on: windows-2019
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         path: microv
 
     - name: Setup MSBuild (PATH)
       id: setup_msbuild_path
-      uses: microsoft/setup-msbuild@v1.0.2
+      uses: microsoft/setup-msbuild@v2
 
     - name: Setup
       run: |
@@ -212,7 +212,7 @@ jobs:
         & msbuild /p:Configuration=Release /p:Platform=x64 /p:TargetVersion=Windows10 hypervisor.sln
       shell: pwsh
 
-    - uses: actions/upload-artifact@v2
+    - uses: actions/upload-artifact@v4
       with:
         name: microv_userspace_debug
         path: |
@@ -221,13 +221,13 @@ jobs:
   build-drivers:
     runs-on: windows-2019
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         path: microv
 
     - name: Setup MSBuild (PATH)
       id: setup_msbuild_path
-      uses: microsoft/setup-msbuild@v1.0.2
+      uses: microsoft/setup-msbuild@v2
 
     - name: Setup
       run: |
@@ -248,7 +248,7 @@ jobs:
         .\build-all.ps1 -RegisterBasedAbi
       shell: pwsh
 
-    - uses: actions/upload-artifact@v2
+    - uses: actions/upload-artifact@v4
       with:
         name: microv_drivers
         path: |
@@ -270,13 +270,13 @@ jobs:
   build-drivers-nocerts:
     runs-on: windows-2019
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         path: microv
 
     - name: Setup MSBuild (PATH)
       id: setup_msbuild_path
-      uses: microsoft/setup-msbuild@v1.0.2
+      uses: microsoft/setup-msbuild@v2
 
     - name: Setup
       run: |
@@ -301,7 +301,7 @@ jobs:
         .\build-all.ps1 -RegisterBasedAbi
       shell: pwsh
 
-    - uses: actions/upload-artifact@v2
+    - uses: actions/upload-artifact@v4
       with:
         name: microv_drivers_nocerts
         path: |