PYTHON-5500 Mark test_dns_failures_logging as flaky (#2480)

Author: blink1073

.evergreen/scripts/install-dependencies.sh

@@ -52,6 +52,8 @@ if ! command -v just &>/dev/null; then
   echo "Installing just..."
   mkdir -p "$_BIN_DIR" 2>/dev/null || true
   curl --proto '=https' --tlsv1.2 -sSf https://just.systems/install.sh | bash -s -- $_TARGET --to "$_BIN_DIR" || {
+    # Remove just file if it exists (can be created if there was an install error).
+    rm -f ${_BIN_DIR}/just
     _pip_install rust-just just
   }
   echo "Installing just... done."

test/asynchronous/test_srv_polling.py

@@ -225,6 +225,7 @@ def response_callback(*args):
 
             await self.run_scenario(response_callback, False)
 
+    @flaky(reason="PYTHON-5500")
     async def test_dns_failures_logging(self):
         from dns import exception
 

test/test_srv_polling.py

@@ -225,6 +225,7 @@ def response_callback(*args):
 
             self.run_scenario(response_callback, False)
 
+    @flaky(reason="PYTHON-5500")
     def test_dns_failures_logging(self):
         from dns import exception