Fix trailing space in ConnectionPool.Key string #162

Job	Run time
Unit tests / Construct unit test matrix	6s
Release builds / Construct release build matrix	4s
Cxx interop / Construct Cxx interop matrix	6s
Soundness / Broken symlinks check	6s
Soundness / License headers check	5s
Soundness / Python lint check	6s
Soundness / Format check	44s
Soundness / Shell check	41s
Soundness / Documentation check	3m 4s
Soundness / API breakage check	4m 40s
Soundness / YAML lint check	4s
Soundness / Unacceptable language check	4s
Static SDK / Static SDK / Linux (main Jammy)	4m 35s
Static SDK / Static SDK / Linux (latest-release Jammy)	3m 41s
Release builds / Release builds / Linux (nightly-next)	5m 10s
Release builds / Release builds / Linux (6.1)	4m 17s
Release builds / Release builds / Linux (nightly-main)	4m 59s
Release builds / Release builds / Linux (6.0)	3m 58s
Release builds / Release builds / Linux (5.10)	3m 41s
Unit tests / Unit tests / Linux (5.10)	5m 0s
Unit tests / Unit tests / Linux (nightly-next)	6m 26s
Unit tests / Unit tests / Linux (nightly-main)	7m 23s
Unit tests / Unit tests / Linux (6.0)	5m 36s
Unit tests / Unit tests / Linux (6.1)	5m 30s
Cxx interop / Cxx interop / Linux (nightly-main)	3m 41s
Cxx interop / Cxx interop / Linux (5.10)	2m 38s
Cxx interop / Cxx interop / Linux (6.1)	3m 2s
Cxx interop / Cxx interop / Linux (6.0)	3m 6s
Cxx interop / Cxx interop / Linux (nightly-next)	4m 0s
	1h 26m 33s

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