Fix Create Weekly Issue: Meetup Weekly date to show next week's date

Fixes #591

Modify the `Create Weekly Issue` workflow to generate issues with the date of the following week's meetup.

* Update the calculation of `nextTuesday` to add an additional 7 days.
* Update the `dateString` to reflect the new `nextTuesday` date.

---

For more details, open the [Copilot Workspace session](https://copilot-workspace.githubnext.com/UNopenGIS/7/issues/591?shareId=XXXX-XXXX-XXXX-XXXX).

.github/workflows/issues-weekly-creation.yml

@@ -1,39 +1,39 @@
-name: Create Weekly Issue
-
-on:
-  schedule:
-    # Schedule to run every Tuesday at 13:00 (1 PM) JST (04:00 UTC)
-    - cron: '0 4 * * 2'
-  workflow_dispatch:
-
-jobs:
-  create-issue:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Create GitHub Issue
-        uses: actions/github-script@v6
-        with:
-          script: |
-            const now = new Date();
-            const nextTuesday = new Date(now);
-            nextTuesday.setDate(now.getDate() + ((2 + 7 - now.getDay()) % 7));
-            const year = nextTuesday.getFullYear();
-            const month = String(nextTuesday.getMonth() + 1).padStart(2, '0');
-            const day = String(nextTuesday.getDate()).padStart(2, '0');
-            const dateString = `${year}-${month}-${day}T12:30/12:55+09:00`;
-
-            const issueTitle = '🖐Smart Maps Meetup Weekly';
-            const issueBody = `
-            ## ${dateString} 🖐Smart Maps Meetup Weekly
-            ### 接続アドレス
-            https://teams.microsoft.com/l/meetup-join/19%3ameeting_YWNjZDBlNDMtY2RiNi00YjE5LTkyMzYtMWI5MjE2NzM3NTU5%40thread.v2/0?context=%7b%22Tid%22%3a%22eba9fc42-5588-4d31-8a4e-6e1bf79d31c0%22%2c%22Oid%22%3a%22265cf6f7-5673-4ef0-93bc-ebb87d669a75%22%7d
-
-            会議 ID: 429 235 468 444 
-            パスコード: EZycz3`;
-            const issue = await github.rest.issues.create({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              title: issueTitle,
-              body: issueBody
-            });
-            console.log(`Created issue ${issue.data.html_url}`);
+name: Create Weekly Issue
+
+on:
+  schedule:
+    # Schedule to run every Tuesday at 13:00 (1 PM) JST (04:00 UTC)
+    - cron: '0 4 * * 2'
+  workflow_dispatch:
+
+jobs:
+  create-issue:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Create GitHub Issue
+        uses: actions/github-script@v6
+        with:
+          script: |
+            const now = new Date();
+            const nextTuesday = new Date(now);
+            nextTuesday.setDate(now.getDate() + ((2 + 7 - now.getDay()) % 7) + 7);
+            const year = nextTuesday.getFullYear();
+            const month = String(nextTuesday.getMonth() + 1).padStart(2, '0');
+            const day = String(nextTuesday.getDate()).padStart(2, '0');
+            const dateString = `${year}-${month}-${day}T12:30/12:55+09:00`;
+
+            const issueTitle = '🖐Smart Maps Meetup Weekly';
+            const issueBody = `
+            ## ${dateString} 🖐Smart Maps Meetup Weekly
+            ### 接続アドレス
+            https://teams.microsoft.com/l/meetup-join/19%3ameeting_YWNjZDBlNDMtY2RiNi00YjE5LTkyMzYtMWI5MjE2NzM3NTU5%40thread.v2/0?context=%7b%22Tid%22%3a%22eba9fc42-5588-4d31-8a4e-6e1bf79d31c0%22%2c%22Oid%22%3a%22265cf6f7-5673-4ef0-93bc-ebb87d669a75%22%7d
+
+            会議 ID: 429 235 468 444 
+            パスコード: EZycz3`;
+            const issue = await github.rest.issues.create({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              title: issueTitle,
+              body: issueBody
+            });
+            console.log(`Created issue ${issue.data.html_url}`);