CI: correct sponsors README generation

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

.github/workflows/sponsors.yml

@@ -11,20 +11,20 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Generate Sponsors (bronze) 💖
-        uses: JamesIves/github-sponsors-readme-action@1.0.5
+        uses: slimsag/github-sponsors-readme-action@dev
         with:
           token: ${{ secrets.SLIMSAG_SPONSORS_PAT }}
           file: 'README.md'
-          maximum: 6
+          maximum: 600 # cents
           marker: 'bronze'
 
       - name: Generate Sponsors (silver) 💖
-        uses: JamesIves/github-sponsors-readme-action@1.0.5
+        uses: slimsag/github-sponsors-readme-action@dev
         with:
           token: ${{ secrets.SLIMSAG_SPONSORS_PAT }}
           file: 'README.md'
-          minimum: 24
-          maximum: 50
+          minimum: 250 # cents
+          maximum: 260 # cents
           marker: 'silver'
 
       - name: Push changes to GitHub