chore(dependabot): reduce Dependabot PIP scope to non-major updates

Change-Id: I3213ad5ea76559e4774bb995fbe5ca4208b04792
Signed-off-by: Chris Kay <chris.kay@arm.com>
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 3f1fff2..decb2f9 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -42,7 +42,7 @@
     groups:
       dev-deps:
         patterns: ["*"]
-        update-types: ["major", "minor", "patch"]
+        update-types: ["minor", "patch"]
 
   - target-branch: "lts-v2.10"
     package-ecosystem: "pip"