docs: add DNS rebinding protection guide #1545

Job	Run time
checks / pre-commit	16s
checks / readme-snippets	11s
checks / test (3.10, lowest-direct, ubuntu-latest)	42s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.11, lowest-direct, windows-latest)	2m 22s
checks / test (3.10, lowest-direct, windows-latest)	2m 42s
checks / test (3.14, lowest-direct, windows-latest)	2m 23s
checks / test (3.12, locked, ubuntu-latest)	50s
checks / test (3.10, locked, ubuntu-latest)	40s
checks / test (3.13, locked, windows-latest)	2m 5s
checks / test (3.14, locked, windows-latest)	3m 9s
checks / test (3.13, locked, ubuntu-latest)	39s
checks / test (3.14, locked, ubuntu-latest)	2m 7s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.13, lowest-direct, ubuntu-latest)	42s
checks / test (3.13, lowest-direct, windows-latest)	2m 19s
checks / test (3.12, lowest-direct, windows-latest)	3m 27s
checks / test (3.12, locked, windows-latest)	2m 58s
checks / test (3.11, locked, ubuntu-latest)	44s
checks / test (3.10, locked, windows-latest)	2m 12s
checks / test (3.12, lowest-direct, ubuntu-latest)	47s
checks / test (3.11, locked, windows-latest)	2m 21s
all-green	3s
	35m 27s

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