Revert "Require importlib_resources <6" #1637

Job	Run time
Build installer (linux-64)	8m 39s
Build installer (linux-aarch64)	6m 57s
Build installer (linux-ppc64le)	6m 30s
Build installer (osx-arm64)	6m 7s
Build installer (osx-64)	7m 31s
macOS (x86_64) tests (macos-13)	1m 48s
Basic tests (centos:7)	58s
Create environment.yaml (linux-64)	40s
Basic tests (centos:8)	58s
Integration tests (Py3 server) (rel-v8r0)	20m 48s
Integration tests (Py3 server) (integration)	22m 13s
macOS (arm64) tests (macos-14)	1m 11s
macOS (arm64) tests (macos-15)	53s
Show release notes and diff	2m 6s
	1h 27m 19s

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