test(loguru): Remove hardcoded line number in test_just_log (#4552)

Use regex to check line number instead of hard coding it

Fixes GH-4454
#4454
<!-- Describe your PR here -->

Changed the loguru test_just_log test to use a regex for the log format instead of a hard-coded line number.

Author: srothh

tests/integrations/loguru/test_loguru.py

@@ -1,4 +1,5 @@
 from unittest.mock import MagicMock, patch
+import re
 
 import pytest
 from loguru import logger
@@ -56,10 +57,10 @@ def test_just_log(
 
     getattr(logger, level.name.lower())("test")
 
-    formatted_message = (
-        " | "
-        + "{:9}".format(level.name.upper())
-        + "| tests.integrations.loguru.test_loguru:test_just_log:57 - test"
+    expected_pattern = (
+        r" \| "
+        + r"{:9}".format(level.name.upper())
+        + r"\| tests\.integrations\.loguru\.test_loguru:test_just_log:\d+ - test"
     )
 
     if not created_event:
@@ -72,7 +73,7 @@ def test_just_log(
             (breadcrumb,) = breadcrumbs
             assert breadcrumb["level"] == expected_sentry_level
             assert breadcrumb["category"] == "tests.integrations.loguru.test_loguru"
-            assert breadcrumb["message"][23:] == formatted_message
+            assert re.fullmatch(expected_pattern, breadcrumb["message"][23:])
         else:
             assert not breadcrumbs
 
@@ -85,7 +86,7 @@ def test_just_log(
     (event,) = events
     assert event["level"] == expected_sentry_level
     assert event["logger"] == "tests.integrations.loguru.test_loguru"
-    assert event["logentry"]["message"][23:] == formatted_message
+    assert re.fullmatch(expected_pattern, event["logentry"]["message"][23:])
 
 
 def test_breadcrumb_format(sentry_init, capture_events, uninstall_integration, request):