Fix Node 25 musl builds and add Node 25 to test matrix

- Update Node 25 musl builds to use node:25-alpine3.23 instead of node:24-alpine3.20
- Add Node 25 to test matrix to ensure ABI 141 binaries are tested in CI

Author: cursoragent

.github/workflows/ci.yml

@@ -76,7 +76,7 @@ jobs:
             node: 24
             binary: linux-x64-musl-137
           - os: ubuntu-22.04
-            container: node:24-alpine3.20
+            container: node:25-alpine3.23
             node: 25
             binary: linux-x64-musl-141
 
@@ -125,7 +125,7 @@ jobs:
             binary: linux-arm64-musl-137
           - os: ubuntu-22.04
             arch: arm64
-            container: node:24-alpine3.20
+            container: node:25-alpine3.23
             node: 25
             binary: linux-arm64-musl-141
 
@@ -353,7 +353,7 @@ jobs:
             macos-15-intel, # macOS x64
             windows-latest,
           ]
-        node: [18, 20, 22, 24]
+        node: [18, 20, 22, 24, 25]
     steps:
       - name: Check out current commit
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4