Fix concurrency issue in DialAndSendWithContext #134

Job	Run time
Dependency review	10s
Go vulnerabilities check	21s
Test with Codecov coverage (ubuntu-latest / 1.23)	1m 9s
golangci-lint (1.23)	31s
Test with SonarQube review (ubuntu-latest / 1.23)	1m 26s
REUSE Compliance Check	16s
Test on FreeBSD 13.4'	2m 13s
Test on FreeBSD 14.0	2m 22s
Test on FreeBSD 14.1	2m 35s
Test (macos-latest / 1.19)	46s
Test (macos-latest / 1.20)	27s
Test (macos-latest / 1.21)	25s
Test (macos-latest / 1.22)	26s
Test (macos-latest / 1.23)	27s
Test (ubuntu-latest / 1.19)	33s
Test (ubuntu-latest / 1.20)	33s
Test (ubuntu-latest / 1.21)	26s
Test (ubuntu-latest / 1.22)	23s
Test (ubuntu-latest / 1.23)	23s
Test (windows-latest / 1.19)	1m 5s
Test (windows-latest / 1.20)	2m 12s
Test (windows-latest / 1.21)	2m 28s
Test (windows-latest / 1.22)	2m 15s
Test (windows-latest / 1.23)	1m 51s
	25m 43s

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