Add deprecation notice for `NamespacePackageEncountered` (#276) #850

Job	Run time
Lint and check docs build	1m 15s
benchmarks	4m 51s
Run tests for Python 3.12, ubuntu-latest	1m 45s
Run tests for Python 3.11, ubuntu-latest	1m 48s
Run tests for Python 3.11, macos-latest	2m 23s
Run tests for Python 3.13, macos-latest	1m 41s
Run tests for Python 3.11, windows-latest	4m 37s
Run tests for Python 3.12, windows-latest	3m 55s
Run tests for Python 3.10, windows-latest	5m 4s
Run tests for Python 3.12, macos-latest	2m 39s
Run tests for Python 3.10, ubuntu-latest	1m 44s
Run tests for Python 3.13, windows-latest	4m 3s
Run tests for Python 3.10, macos-latest	1m 51s
Run tests for Python 3.14, windows-latest	4m 37s
Run tests for Python 3.14, macos-latest	2m 24s
Run tests for Python 3.13, ubuntu-latest	1m 57s
Run tests for Python 3.14, ubuntu-latest	1m 47s
	48m 21s

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