Explicitly specify permissions for workflows

The workflows need 'write' permission for issues since they are modifying
the issues (closing them, adding labels, comments...).

Previously the workflows relied on the permissive default permissions, see
https://docs.github.com/en/actions/security-guides/automatic-token-authentication#permissions-for-the-github_token

.github/workflows/format-crash-report-in-issue-body.yml

@@ -4,6 +4,9 @@ on:
   issues:
     types: [opened]
 
+permissions:
+  issues: write
+
 jobs:
   format-crash-report:
     runs-on: ubuntu-latest

.github/workflows/minecraft-crash-reported-upstream-check.yml

@@ -3,6 +3,9 @@ on:
   issue_comment:
     types: [created, edited]
 
+permissions:
+  issues: write
+
 jobs:
   check-reported-upstream:
     runs-on: ubuntu-latest

.github/workflows/minecraft-crash.yml

@@ -3,6 +3,9 @@ on:
   issues:
     types: [opened]
 
+permissions:
+  issues: write
+
 jobs:
   check-minecraft-crash:
     runs-on: ubuntu-latest