log/slog: fix faulty test

log/slog: fix faulty test

Adds an optional close quote in the expected log message regex for TestConnections to prevent failing when the source filepath is surrounded in quotes due to it containing one or more spaces.

Fixes #61161

Change-Id: I0dd71fb4389bff963bbfdc668ef4e4dfe787eafc
Reviewed-on: https://go-review.googlesource.com/c/go/+/508055
Reviewed-by: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>