Add an issue form for product updates

Provide an issue form for product updates to complement the one for
product submissions. This will encourage people to follow the specific
workflows for submissions and updates.

.github/ISSUE_TEMPLATE/product-update-template.yml

@@ -0,0 +1,58 @@
+---
+name: Update a Product
+description: Update information about a product in the database
+title: "[Product Update]: <vendor> - <product>"
+body:
+  - type: markdown
+    attributes:
+      value: |
+        For questions about choice for status, please see the information below.
+
+        - Unknown - Status unknown. Default choice.
+        - Affected - Reported to be affected by CVE-2021-44228.
+        - Not Affected - Reported to NOT be affected by CVE-2021-44228 and no
+          further action necessary.
+        - Fixed - Patch and/or mitigations available (see provided links).
+        - Under Investigation - Vendor investigating status.
+  - type: textarea
+    id: update-context
+    attributes:
+      label: Context
+      description: Please provide context around the update
+  - type: input
+    id: product-versions
+    attributes:
+      label: Product version(s)
+      description: What version(s) of the product are affected?
+  - type: dropdown
+    id: product-status
+    attributes:
+      label: Product status
+      description: What is the current status of the affected product?
+      options:
+        - Unknown
+        - Affected
+        - Not Affected
+        - Fixed
+        - Under Investigation
+  - type: dropdown
+    id: product-updated
+    attributes:
+      label: Product update available
+      description: Is there an update available for the product?
+      options:
+        - "Yes"
+        - "No"
+  - type: input
+    id: product-update-link
+    attributes:
+      label: Product update link
+      description: If an update is available where can it be found?
+  - type: textarea
+    id: product-notes
+    attributes:
+      label: Notes
+  - type: textarea
+    id: product-references
+    attributes:
+      label: References