ci: be more selective in ci matrix combinations

Author: 3np

.github/workflows/unittests.yml

@@ -8,15 +8,34 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os:
-          - macos-13
-          - ubuntu-22.04
-          - ubuntu-24.04
-        python-version:
-          - "3.8"
-          - "3.12"
-          - "3.13"
-        bitcoind-version: ["25.1", "29.0"]
+        include:
+          - os: macos-13
+            python-version: "3.13"
+            bitcoind-version: "25.1"
+          - os: macos-13
+            python-version: "3.13"
+            bitcoind-version: "29.0"
+          - os: ubuntu-22.04
+            python-version: "3.8"
+            bitcoind-version: "25.1"
+          - os: ubuntu-22.04
+            python-version: "3.12"
+            bitcoind-version: "25.1"
+          - os: ubuntu-24.04
+            python-version: "3.13"
+            bitcoind-version: "25.1"
+          - os: ubuntu-24.04
+            python-version: "3.13"
+            bitcoind-version: "29.0"
+#        os:
+#          - macos-13
+#          - ubuntu-22.04
+#          - ubuntu-24.04
+#        python-version:
+#          - "3.8"
+#          - "3.12"
+#          - "3.13"
+#        bitcoind-version: ["25.1", "29.0"]
 
     steps:
       - uses: actions/checkout@v3