Try GHA build fixes

Author: animetosho

.github/workflows/build-dev-mac-x64.yml

@@ -14,7 +14,9 @@ jobs:
       - run: npm install --production --ignore-scripts
       - run: npm install --production
         working-directory: nexe
-      - run: pip install pipes
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
       - run: node build
         working-directory: nexe
       - run: nexe/parpar --version

.github/workflows/build-dev-win64.yml

@@ -20,7 +20,7 @@ jobs:
       - run: npm install --production
         working-directory: nexe
       # diagnose weird execution failure
-      - run: C:\Program Files\Git\usr\bin\sed -i "s/child_process_1\.spawn/this.log.step('Executing ' + command + ' ' + args); \0/" node_modules/nexe/lib/compiler.js
+      - run: "C:\Program Files\Git\usr\bin\sed" -i "s/child_process_1\.spawn/this.log.step('Executing ' + command + ' ' + args); \0/" node_modules/nexe/lib/compiler.js
         working-directory: nexe
       - run: node build
         working-directory: nexe

.github/workflows/build.yml

@@ -225,7 +225,9 @@ jobs:
       - run: npm install --production --ignore-scripts
       - run: npm install --production
         working-directory: nexe
-      - run: pip install pipes
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
       - run: node build
         working-directory: nexe
       - run: nexe/parpar --version