Fix nan-version variable name

Author: vrza

.github/workflows/build.yml

@@ -10,7 +10,7 @@ jobs:
       matrix:
         virtual-environment: [ubuntu-latest, windows-2025, ubuntu-24.04-arm]
         node: [16, 18, 20, 22, 24, 25]
-        nan-version: [earliest, latest]
+        nan-version: [nan-earliest, nan-latest]
         include:
           - virtual-environment: macos-latest
             node: 18
@@ -40,7 +40,7 @@ jobs:
 
     - name: Install earliest nan dependency
       shell: bash
-      if: matrix.nan == 'earliest'
+      if: matrix.nan-version == 'nan-earliest'
       run: |
         earliest_nan_version="$(npm pkg get dependencies | jq -r '.[] | ltrimstr("^")')"
         npm install nan@"$earliest_nan_version"