chore(deps): update gmpy2 requirement from ==2.2.* to ==2.3.*

[dependabot]

Updates the requirements on gmpy2 to permit the latest version.

Changelog

Sourced from gmpy2's changelog.

Changes in gmpy2 2.3.0

• Drop support for CPython < 3.9, experimental support for PyPy. (skirpichev)
• Improved support for mixed mpfr and mpc arithmetic. (skirpichev)
• Preliminary support for free-threaded builds. (skirpichev)
• Fix behavior and memory leaks for contexts. (skirpichev)
• Fix memory leaks for mpfr caching. (skirpichev)
• Fix rounding errors in float(mpz) and float(mpq). (skirpichev)
• Add missing methods to mpz and mpq. (skirpichev)
• Fix round(mpz, ndigits) if ndigits is negative. (skirpichev)
• Use context's rounding mode per default in format and round. (skirpichev)
• Use setuptools_scm to manage versions. (skirpichev)
• Fix exception for float(mpfr('inf')) (was: OverflowError). (skirpichev)
• Ignore sign bit of NaN's in string output. (skirpichev)
• Support '%' formatting type for mpfr's. (skirpichev)
• Support floating-point formatting types for mpz's. (skirpichev)
• Set default precision to 6 for 'e'/'E' format types. (skirpichev)
• Support "alternate form" in floating-point formatting. (skirpichev)
• Improve documentation for format support in gmpy2's types. (skirpichev)
• Use 'g' (not 'f') as default formatting type for mpfr's. (skirpichev)
• Specify case, when formatting type and precision are missing. (skirpichev)
• Disable scripts/mp_bitcnt_t.diff in binary wheels. (skirpichev)

Changes in gmpy2 2.2.2

• Fix memory leak for mpfr/mpc cache, see issue 511.
• Fix memory leak in GMPy_CTXT_Exit(), see issue 515.
• Restore 'm' in library list, see issue 538.
• Adjust to_bytes() behavior to match CPython.
• Provide wheels for CPython v3.14.
• Provide wheels for Linux and Windows ARM64.

Changes in gmpy2 2.2.1

• Fix internal use of char when int should be used. (jamesjer)
• Add :meth:xmpz.bit_count. (skirpichev)

Changes in gmpy2 2.2.0

• Remove support for versions of Python < 3.7. (skirpichev)
• Support more modern build tools. (skirpichev)
• Use contextvars to manage gmpy2 contexts. (casevh)
• _mpmath functions now use vectorcall protocol. (casevh)
• Many documentation updates. (skirpichev)
• Add :meth:mpz.as_integer_ratio() / :meth:mpz.to_bytes() and :meth:mpz.from_bytes(). (skirpichev)

... (truncated)

Commits

• 4a4237c Merge pull request #677 from skirpichev/release-v2.3.0
• a6ec5f9 Simplify numpy deps
• 25bd027 Drop docs.yml (now redundant)
• f795d1f Merge pull request #675 from skirpichev/remove-bitcnt-patch/674
• dacbcfe Disable mp_bitcnt_t.diff in binary wheels
• 593b140 Merge pull request #670 from skirpichev/misc
• 3cdfc1a Update src/pythoncapi_compat.h
• 2181ec9 Merge pull request #672 from gmpy2/dependabot/github_actions/sorenlouv/backpo...
• 8a3aea2 Workaround curl failures in scripts/cibw_before_all.sh
• 8a16577 Merge pull request #671 from gmpy2/dependabot/github_actions/actions/upload-a...
• Additional commits viewable in compare view

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