remove deprecated code and use modern methods/classes/code where applicable

.github/ISSUE_TEMPLATE/BUG-REPORT.yml

@@ -1,6 +1,6 @@
 name: Bug report
 description: Report problems/issues here
-labels: bug
+labels: [bug]
 body:
 - type: checkboxes
   attributes:

.github/ISSUE_TEMPLATE/FEATURE-REQUEST.yml

@@ -1,6 +1,6 @@
 name: Feature request
 description: Use this to request new features and/or changes
-labels: enhancement
+labels: [enhancement]
 body:
 - type: checkboxes
   attributes:

.github/ISSUE_TEMPLATE/config.yml

@@ -1 +1,3 @@
+#file: noinspection YAMLSchemaValidation
+#IntelliJ IDEA interprets this as another issue template so the above line is required
 blank_issues_enabled: false