This should be enough to get rid of the 3 lingering warnings in our main
test suite.

(cherry picked from commit 751a0d7)

Backported PRs:
- [x] #57142 <!-- Add reference to time_ns in time -->
- [x] #57241 <!-- Handle `waitpid` race condition when `SIGCHLD` is set
to `SIG_IGN` -->
- [x] #57249 <!-- restore non-freebsd-unix fix for profiling -->
- [x] #57211 <!-- Ensure read/readavailable for BufferStream are
threadsafe -->
- [x] #57262 <!-- edit NEWS for v1.12 -->
- [x] #57226 <!-- cfunction: reimplement, as originally planned, for
reliable performance -->
- [x] #57253 <!-- bpart: Fully switch to partitioned semantics -->
- [x] #57273 <!-- fix "Right arrow autocompletes at line end"
implementation -->
- [x] #57280 <!-- dep: Update JuliaSyntax -->
- [x] #57229 <!-- staticdata: Close data race after backedge insertion
-->
- [x] #57298 <!-- Updating binding version to fix MMTk CI -->
- [x] #57248 <!-- improve concurrency safety for `Compiler.finish!` -->
- [x] #57312 <!-- Profile.print: de-focus sleeping frames as gray -->
- [x] #57289 <!-- Make `OncePerX` subtype `Function` -->
- [x] #57310 <!-- Make ptls allocations at least 128 byte aligned -->
- [x] #57311 <!-- Add a warning for auto-import of types -->
- [x] #57338 <!-- fix typo in Float32 random number generation -->
- [x] #57293 <!-- Fix getfield_tfunc when order or boundscheck is Vararg
-->
- [x] #57349 <!-- docs: fix-up world-age handling for META access -->
- [x] #57344 <!-- Add missing type asserts when taking the queue out of
the task struct -->
- [x] #57348 <!-- 🤖 [master] Bump the SparseArrays stdlib from 212981b
to 72c7cac -->
- [x] #55040 <!-- Allow macrocall as function sig -->
- [x] #57299 <!-- Add missing latestworld after parameterized type alias
-->

…mpatibility

Julia 1.12 introduced binding partitions (JuliaLang/julia#57133, #57150,
#57253) which enforce strict world-age semantics for global bindings.
When DocStringExtensions performs method resolution during docstring
formatting, the calls happen in a stale world age and fail to find
matching methods. This is the same pattern that Julia's own doc system
(JuliaLang/julia#57349) and Documenter.jl (JuliaDocs/Documenter.jl#2624)
adopted for 1.12 compatibility.

Changes:
- Wrap all Docs.resolve() calls with Base.invokelatest
- Wrap methods() calls in getmethods!() with Base.invokelatest
- Wrap Base.return_types() call with Base.invokelatest
- Add nothing guard on findfirst/findlast result in TypedMethodSignatures
  to prevent ArgumentError when no matching tuple is found
- Add world-age safety tests exercising all abbreviation types via
  Base.invokelatest to simulate the stale world-age scenario

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>