session: fix pool renewal race causing double statement execution #1017

Job	Run time
Test wheels building / Prepare matrix to run for 3.13 on `linux,macos-x86,macos-arm,windows,linux-aarch64`	4s
Test wheels building / Build source distribution	9s
Test wheels building / Build wheels for macos-x86 on macos-15-intel	34m 44s
Test wheels building / Build wheels for macos-arm on macos-14	12m 44s
Test wheels building / Build wheels for windows on windows-2022	44m 59s
Test wheels building / Build wheels for linux-aarch64 on ubuntu-24.04-arm	14m 52s
Test wheels building / Build wheels for linux on ubuntu-24.04	13m 31s
	2h 1m 3s

Provide feedback