Update lukka/get-cmake action to v4

Author: openvpn-inc-ci

.github/workflows/build.yaml

@@ -51,7 +51,7 @@ jobs:
       - name: Checkout OpenVPN
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
-      - uses: lukka/get-cmake@56d043d188c3612951d8755da8f4b709ec951ad6 # v3.31.6
+      - uses: lukka/get-cmake@28983e0d3955dba2bb0a6810caae0c6cf268ec0c # v4.0.0
       - name: Restore from cache and install vcpkg
         uses: lukka/run-vcpkg@5e0cab206a5ea620130caf672fce3e4a6b5666a1 # v11.5
         with:
@@ -227,7 +227,7 @@ jobs:
       runs-on: windows-latest
       steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-      - uses: lukka/get-cmake@56d043d188c3612951d8755da8f4b709ec951ad6 # v3.31.6
+      - uses: lukka/get-cmake@28983e0d3955dba2bb0a6810caae0c6cf268ec0c # v4.0.0
 
       - name: Install rst2html
         run: python -m pip install --upgrade pip docutils