CI: GitHub actions upgrade (#772), closes #771

* Upgraded checkout@v3 to checkout@v4

* Upgrade cache@v3 to cache@v4

.github/actions/ngen-build/action.yaml

@@ -108,7 +108,7 @@ runs:
 
         - name: Cache Boost Dependency
           id: cache-boost-dep
-          uses: actions/cache@v3
+          uses: actions/cache@v4
           with:
             path: boost_1_79_0
             key: unix-boost-dep

.github/workflows/documentation.yml

@@ -20,7 +20,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
     # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Make sure initial ownership is correct
       run: sudo chown -R runner:docker docs/
@@ -35,7 +35,7 @@ jobs:
       run: sudo chown -R runner:docker docs/
 
     - name: Switch to gh-pages
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         ref: gh-pages
         clean: false

.github/workflows/test_and_validate.yml

@@ -31,7 +31,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
     - name: Checkout the commit
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Build Unit Tests
       uses: ./.github/actions/ngen-build
@@ -66,7 +66,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Build PET Tests
         uses: ./.github/actions/ngen-build
@@ -94,7 +94,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Build Unit Tests
         uses: ./.github/actions/ngen-build
@@ -123,7 +123,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       #make sure cxx bmi is initialized/ready
       - uses: ./.github/actions/ngen-submod-build
@@ -158,7 +158,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Build Unit Tests
         uses: ./.github/actions/ngen-build
@@ -191,7 +191,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Build Unit Tests
         uses: ./.github/actions/ngen-build
@@ -224,7 +224,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out repository under $GITHUB_WORKSPACE, so job can access it
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Build Unit Tests
         uses: ./.github/actions/ngen-build
@@ -259,7 +259,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Build Unit Tests
         uses: ./.github/actions/ngen-build