fix trailing comma not matched in the case of alphanumeric issue (go-gitea#32945)

Fix go-gitea#32428.

Patch the regex to match `,`besides `.` `"` `'` `:` and space.

(cherry picked from commit fb75151)

Author: katsusan

modules/references/references.go

@@ -32,7 +32,7 @@ var (
 	// issueNumericPattern matches string that references to a numeric issue, e.g. #1287
 	issueNumericPattern = regexp.MustCompile(`(?:\s|^|\(|\[|\'|\")([#!][0-9]+)(?:\s|$|\)|\]|\'|\"|[:;,.?!]\s|[:;,.?!]$)`)
 	// issueAlphanumericPattern matches string that references to an alphanumeric issue, e.g. ABC-1234
-	issueAlphanumericPattern = regexp.MustCompile(`(?:\s|^|\(|\[|\"|\')([A-Z]{1,10}-[1-9][0-9]*)(?:\s|$|\)|\]|:|\.(\s|$)|\"|\')`)
+	issueAlphanumericPattern = regexp.MustCompile(`(?:\s|^|\(|\[|\"|\')([A-Z]{1,10}-[1-9][0-9]*)(?:\s|$|\)|\]|:|\.(\s|$)|\"|\'|,)`)
 	// crossReferenceIssueNumericPattern matches string that references a numeric issue in a different repository
 	// e.g. org/repo#12345
 	crossReferenceIssueNumericPattern = regexp.MustCompile(`(?:\s|^|\(|\[)([0-9a-zA-Z-_\.]+/[0-9a-zA-Z-_\.]+[#!][0-9]+)(?:\s|$|\)|\]|[:;,.?!]\s|[:;,.?!]$)`)

modules/references/references_test.go

@@ -466,6 +466,7 @@ func TestRegExp_issueAlphanumericPattern(t *testing.T) {
 		"ABC-123:",
 		"\"ABC-123\"",
 		"'ABC-123'",
+		"ABC-123, unknown PR",
 	}
 	falseTestCases := []string{
 		"RC-08",