docs: Remove `rspack.core` version constraint #136

Job	Run time
PR title check	3s
Code checks / Spell check	6s
Code checks / Actions lint check	30s
Docstrings checks / Docstrings checks	19s
Doc checks / Doc checks / Docs check	1m 8s
Code checks / Lint check / Lint check (3.14)	12s
Code checks / Type check / Type check (3.12)	10s
Code checks / Lint check / Lint check (3.10)	8s
Code checks / Type check / Type check (3.13)	11s
Code checks / Type check / Type check (3.10)	10s
Code checks / Type check / Type check (3.14)	10s
Code checks / Type check / Type check (3.11)	10s
Code checks / Lint check / Lint check (3.12)	13s
Code checks / Lint check / Lint check (3.13)	14s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	56s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 17s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 20s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.10)	57s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	56s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	1m 14s
Tests / Unit tests / Unit tests (windows-latest, 3.10)	1m 15s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	59s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	1m 19s
Code checks / Lint check / Lint check (3.11)	8s
Tests / Integration tests / Integration tests (ubuntu-latest, 3.10)	52s
Tests / Integration tests / Integration tests (ubuntu-latest, 3.14)	1m 0s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	1m 0s
	16m 57s

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