Minor grammar improvement in issue templates

.. though this certainly can be improved some still, the entire wording
of the sentence. That will be considered later.

Thank you to @SirWumpus for indirectly making me aware of this: I know
he hates templates so I feel like I should thank him specially :-)

.github/ISSUE_TEMPLATE/author_details.yml

@@ -8,7 +8,7 @@ body:
     label: Is there an existing issue for this?
     description: Please search to see if an issue already exists for the problem you're reporting.
     options:
-    - label: I have searched for existing issues and did not find anything like it
+    - label: I have searched for existing issues and did not find anything like this
       required: true
 - type: textarea
   attributes:

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -8,7 +8,7 @@ body:
     label: Is there an existing issue for this?
     description: Please search to see if an issue already exists for the feature you're suggesting.
     options:
-    - label: I have searched for existing issues and did not find anything like it
+    - label: I have searched for existing issues and did not find anything like this
       required: true
 
 - type: textarea

.github/ISSUE_TEMPLATE/other_issue.yml

@@ -7,7 +7,7 @@ body:
     label: Is there an existing issue for this?
     description: Please search to see if an issue already exists for the problem you're reporting.
     options:
-    - label: I have searched for existing issues and did not find anything like it
+    - label: I have searched for existing issues and did not find anything like this
       required: true
 - type: textarea
   attributes:

.github/ISSUE_TEMPLATE/website_issue.yml

@@ -8,7 +8,7 @@ body:
     label: Is there an existing issue for this?
     description: Please search to see if an issue already exists for the problem you're reporting.
     options:
-    - label: I have searched for existing issues and did not find anything like it
+    - label: I have searched for existing issues and did not find anything like this
       required: true
 - type: textarea
   attributes: