Schedule Dependabot updates for Monday at 1am JST

This change configures all Dependabot update checks (for both Gradle
dependencies and GitHub Actions) to run weekly on Monday at 1:00 AM JST.
This provides a consistent schedule aligned with the Japan timezone for
all dependency update checks.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: Torch3333

.github/dependabot.yml

@@ -9,6 +9,9 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+      day: "monday"
+      time: "01:00"
+      timezone: "Asia/Tokyo"
     ignore:
       - dependency-name: "*"
         update-types: [ "version-update:semver-major" ]
@@ -24,6 +27,9 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+      day: "monday"
+      time: "01:00"
+      timezone: "Asia/Tokyo"
 
   - package-ecosystem: "github-actions"
     target-branch: "3"
@@ -34,6 +40,9 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+      day: "monday"
+      time: "01:00"
+      timezone: "Asia/Tokyo"
 
   - package-ecosystem: "github-actions"
     target-branch: "3.16"
@@ -44,6 +53,9 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+      day: "monday"
+      time: "01:00"
+      timezone: "Asia/Tokyo"
 
   - package-ecosystem: "github-actions"
     target-branch: "3.15"
@@ -54,6 +66,9 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+      day: "monday"
+      time: "01:00"
+      timezone: "Asia/Tokyo"
 
   - package-ecosystem: "github-actions"
     target-branch: "3.14"
@@ -64,6 +79,9 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+      day: "monday"
+      time: "01:00"
+      timezone: "Asia/Tokyo"
 
   - package-ecosystem: "github-actions"
     target-branch: "3.13"
@@ -74,3 +92,6 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+      day: "monday"
+      time: "01:00"
+      timezone: "Asia/Tokyo"