Tests/LibRegex: Decrease the size of the fork chain test

Author: https://github.com/alimpfard
Commit: 63523d3836
Pull-request: https://github.com/SerenityOS/serenity/pull/9847
Reviewed-by: https://github.com/linusg ✅

Tests/LibRegex/Regex.cpp

@@ -848,7 +848,7 @@ TEST_CASE(case_insensitive_match)
 TEST_CASE(extremely_long_fork_chain)
 {
     Regex<ECMA262> re("(?:aa)*");
-    auto result = re.match(String::repeated('a', 100'000));
+    auto result = re.match(String::repeated('a', 1000));
     EXPECT_EQ(result.success, true);
 }