Fix issue form syntax for GitHub validations

These seemed to work when we created them but GitHub has become more
srict in its validation. That's a whole lot of fun when there's nothing
to verify these locally. Naturally, the top of their "common validation
errors" page says "Issue forms are currently in beta and subject to
change" so that probably explains it just fine.

Author: sigmavirus24

.github/ISSUE_TEMPLATE/01_upload_failed.yml

@@ -44,7 +44,7 @@ body:
     validations:
       required: true
 
-  - type: markdown
+  - type: input
     id: environment-os-other
     attributes:
       label: "If you selected 'Other', describe your Operating System here"
@@ -90,7 +90,7 @@ body:
     validations:
       required: true
 
-  - type: markdown
+  - type: input
     id: package-repository
     attributes:
       label: "Which package repository are you using?"

.github/ISSUE_TEMPLATE/02_bug.yml

@@ -44,10 +44,11 @@ body:
     validations:
       required: true
 
-  - type: markdown
+  - type: input
     id: environment-os-other
     attributes:
       label: "If you selected 'Other', describe your Operating System here"
+      placeholder: "example: Linux hostname 6.5.10-200.fc38.x86_64"
     validations:
       required: false
 
@@ -90,7 +91,7 @@ body:
     validations:
       required: true
 
-  - type: markdown
+  - type: input
     id: package-repository
     attributes:
       label: "Which package repository are you using?"