[skip ci] Update UPGRADING wrt Deprecate GET/POST sessions RFC#15865

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Girgias merged 1 commit intophp:masterfrom

cmb69:cmb/deprecate-get-post-sessions

Sep 13, 2024

Commits on Sep 12, 2024

[skip ci] Update UPGRADING wrt Deprecate GET/POST sessions RFC
cmb69
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