build: sync rustc version warning

[inoway46]

Raise the rustc warning threshold to 1.88 to match BUILDING.md and deps/crates/Cargo.toml.

node/deps/crates/Cargo.toml

Line 7 in 9df97a7

rust-version = "1.88"

Refs: #65912 (comment)

[legendecas]

Mirroring dont-land labels as #65742.

[nodejs-github-bot]

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----------------------------------- PR info ------------------------------------
Title      build: sync rustc version warning (#66794)
   ⚠  Could not retrieve the email or name of the PR's author from user's GitHub profile!
Branch     inoway46:codex/align-rustc-minimum -> nodejs:main
Labels     build, author ready, needs-ci, commit-queue, dont-land-on-v22.x, dont-land-on-v24.x, dont-land-on-v26.x
Commits    1
 - build: align rustc version warning with minimum requirement
Committers 1
 - inoway46 <inoueyuya416@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/66794
Reviewed-By: Richard Lau <richard.lau@ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/66794
Reviewed-By: Richard Lau <richard.lau@ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
--------------------------------------------------------------------------------
   ℹ  This PR was created on Fri, 16 Oct 2026 15:45:09 GMT
   ✔  Approvals: 3
   ✔  - Richard Lau (@richardlau) (TSC): https://github.com/nodejs/node/pull/66794#pullrequestreview-5550624570
   ✔  - Luigi Pinca (@lpinca): https://github.com/nodejs/node/pull/66794#pullrequestreview-5550973379
   ✔  - Chengzhong Wu (@legendecas) (TSC): https://github.com/nodejs/node/pull/66794#pullrequestreview-5551493854
   ✔  Last GitHub CI successful
   ✖  No Jenkins CI runs detected
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