docs: add DNS rebinding protection guide #1550

Job	Run time
checks / pre-commit	32s
checks / readme-snippets	14s
checks / test (3.12, locked, ubuntu-latest)	48s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.10, lowest-direct, windows-latest)	2m 12s
checks / test (3.10, locked, ubuntu-latest)	41s
checks / test (3.13, lowest-direct, windows-latest)	3m 1s
checks / test (3.10, lowest-direct, ubuntu-latest)	41s
checks / test (3.12, lowest-direct, ubuntu-latest)	45s
checks / test (3.11, locked, windows-latest)	2m 11s
checks / test (3.10, locked, windows-latest)	1m 47s
checks / test (3.13, locked, ubuntu-latest)	43s
checks / test (3.13, locked, windows-latest)	2m 2s
checks / test (3.11, lowest-direct, windows-latest)	2m 15s
checks / test (3.14, locked, ubuntu-latest)	2m 9s
checks / test (3.11, locked, ubuntu-latest)	40s
checks / test (3.14, lowest-direct, windows-latest)	2m 1s
checks / test (3.13, lowest-direct, ubuntu-latest)	42s
checks / test (3.12, lowest-direct, windows-latest)	3m 28s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 10s
checks / test (3.14, locked, windows-latest)	2m 54s
checks / test (3.12, locked, windows-latest)	3m 8s
all-green	4s
	34m 52s

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