gh-76785: Use PRId64 to Fix a Compiler Warning on Windows

[ericsnowcurrently]

I accidentally introduced the warning in gh-116328.

(See #116328 (comment).)

• Issue: [subinterpreters] PEP 554 implementation: add interpreters module #76785

[gvanrossum]

Hey @ericsnowcurrently, on macOS I now (or still?) get a warning:

./Modules/_xxinterpqueuesmodule.c:762:22: warning: format specifies type 'long long' but the argument has type 'Py_ssize_t' (aka 'long') [-Wformat] qid, queue->items.count); ^~~~~~~~~~~~~~~~~~ 

[AlexWaygood]

Hey @ericsnowcurrently, on macOS I now (or still?) get a warning:

./Modules/_xxinterpqueuesmodule.c:762:22: warning: format specifies type 'long long' but the argument has type 'Py_ssize_t' (aka 'long') [-Wformat] qid, queue->items.count); ^~~~~~~~~~~~~~~~~~ 

Nikita's already got a PR up to fix it: #116387