update dependabot requirements

Author: jcharkow

.github/dependabot.yml

@@ -1,15 +1,25 @@
 version: 2
+
 updates:
   - package-ecosystem: "pip"
     directory: "/"
     schedule:
       interval: "weekly"
+
     commit-message:
       prefix: "deps"
-    open-pull-requests-limit: 10
+
+    open-pull-requests-limit: 5
+
     allow:
       - dependency-type: "all"
 
+    # --------------------------------------------------
+    # Explicit ignores to avoid unsatisfiable resolutions
+    # --------------------------------------------------
+    ignore:
+      - dependency-name: "tinycss2"
+
     groups:
       # ===============================
       # ABI / compiled scientific stack
@@ -143,7 +153,6 @@ updates:
           - "pygments"
           - "mistune"
           - "pandocfilters"
-          - "tinycss2"
           - "cssselect2"
 
       # ===============================