github: Update to the latest checkout action

Update the actions/checkout plugin to v3.  v2 utilizes Node.js 12
and is deprecated.

	Node.js 12 actions are deprecated. Please update the following
	actions to use Node.js 16: actions/checkout@v2. For more
	information see:
	https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/.1

Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>

.github/workflows/codeql-analysis.yml

@@ -24,7 +24,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: Initialize libseccomp
       uses: ./.github/actions/setup
     - name: Initialize CodeQL

.github/workflows/continuous-integration.yml

@@ -29,7 +29,7 @@ jobs:
 
     steps:
     - name: Checkout from github
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: Initialize libseccomp
       uses: ./.github/actions/setup
     - name: Build libseccomp
@@ -47,7 +47,7 @@ jobs:
 
     steps:
     - name: Checkout from github
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: Initialize libseccomp
       uses: ./.github/actions/setup
     - name: Build libseccomp
@@ -66,7 +66,7 @@ jobs:
 
     steps:
     - name: Checkout from github
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: Initialize libseccomp
       uses: ./.github/actions/setup
     - name: Run scan-build
@@ -80,7 +80,7 @@ jobs:
 
     steps:
     - name: Checkout from github
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: Initialize libseccomp
       uses: ./.github/actions/setup
     - name: Configure libseccomp