stop auto-labeling 'triage'

this hasn't ended up being very useful and just kind of adds noise. we
can still add it to issues that actually need triaging.

Signed-off-by: Alex Suraci <suraci.alex@gmail.com>

.github/ISSUE_TEMPLATE/bug-report.md

@@ -2,7 +2,7 @@
 name: Bug Report
 about: Let us know about a problem with Concourse
 title: ''
-labels: bug, triage
+labels: bug
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/feature-request.md

@@ -2,7 +2,7 @@
 name: Feature Request
 about: Help us understand your use case and expand Concourse's functionality
 title: ''
-labels: enhancement, triage
+labels: enhancement
 assignees: ''
 
 ---