[issue34204] Bump the default pickle protocol in shelve

[Marco Castelluccio]

Change by Marco Castelluccio <mcastelluccio at mozilla.com>:


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nosy: +marco-c
nosy_count: 6.0 -> 7.0
pull_requests: +21928
pull_request: https://github.com/python/cpython/pull/22751

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34204>
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