chore: Lowercase GitHub Labels

.github/ISSUE_TEMPLATE/report_issue.yml

@@ -4,7 +4,7 @@
 
 name: Report Issue
 description: Report a plugin issue in LNReader
-labels: [Bug]
+labels: [bug]
 body:
   - type: dropdown
     id: source

.github/ISSUE_TEMPLATE/request_feature.yml

@@ -1,6 +1,6 @@
 name: Request Feature
 description: Suggest an improvement for an existing plugin
-labels: [Feature Request]
+labels: [feature request]
 body:
   - type: textarea
     id: feature-description

.github/ISSUE_TEMPLATE/request_plugin.yml

@@ -1,6 +1,6 @@
 name: Request Plugin
 description: Request a new plugin for LNReader
-labels: [Plugin Request]
+labels: [plugin request]
 body:
   - type: markdown
     attributes: