dev: remove placeholder titles form issue forms

Too many people not modifying the title and now my inbox is full of
"Briefly summarize your issue" issues. At least when it's blank by
default, Github won't let you submit it until you fill it out.

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -1,7 +1,6 @@
 ---
 name: 📝 Bug Report
 description: Report a bug, error, or misbehavior
-title: Briefly summarize your issue here
 labels: ["1. bug", "needs-triage"]
 body:
 - type: markdown

.github/ISSUE_TEMPLATE/bump_request.yml

@@ -1,7 +1,6 @@
 ---
 name: 📝 Bump Package
 description: Request a pinned package be updated
-title: "[BUMP] package1, package2, ..."
 labels: ["1. update", "needs-triage"]
 body:
 - type: markdown

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -1,7 +1,6 @@
 ---
 name: 📝 Feature Request
 description: Propose a new idea or feature
-title: Briefly summarize your request here
 labels: ["1. request", "needs-triage"]
 body:
 - type: markdown