Update jsonschema and openapi related python pkgs

[tornaria]

Testing the changes

• I tested the changes in this PR: briefly

[tornaria]

There was an issue with cross building python3-rpds-py that is now solved.
For the record, this needed build_helper=rust and

if [ "$CROSS_BUILD" ]; then
	makedepends="python3 rust-std"
	export PYO3_CROSS_LIB_DIR="${XBPS_CROSS_BASE}/usr/lib"
	export PYO3_CROSS_INCLUDE_DIR="${XBPS_CROSS_BASE}/usr/include"
fi

which I took from python3-adblock.

I wonder if the PYO3_CROSS... variables should go into the rust build_helper (this is repeated in 4 and now 5 templates).

[tornaria]

I bite the bullet and moved the PYO3_CROSS_... settings to the rust build-helper.

In #46086 I refactor the other pkgs using PYO3_CROSS_.... Both PRs share the first commit.

[tornaria]

cc: @jcgruenhage (python3-jsonschema: update to 4.19.1.)