List Go version 1.18 in the docs.

[workingloong]

What changes were proposed in this pull request?

List Go version 1.18 in the docs to deploy ElasticJob.

Why are the changes needed?

Make deploy with go1.22 raises errors.

/Users/yuzhi.wx/work/dlrover/dlrover/go/operator/bin/controller-gen object:headerFile="hack/boilerplate.go.txt" paths="./..."
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x0 pc=0x104c88cb4]

goroutine 27 [running]:
go/types.(*Checker).handleBailout(0x140000cf600, 0x140016a5d18)
	/usr/local/go/src/go/types/check.go:367 +0x9c
panic({0x104f53a60?, 0x1054dbf30?})
	/usr/local/go/src/runtime/panic.go:770 +0x124
go/types.(*StdSizes).Sizeof(0x0, {0x10501cc70, 0x1054e47c0})
	/usr/local/go/src/go/types/sizes.go:228 +0x314
go/types.(*Config).sizeof(...)
	/usr/local/go/src/go/types/sizes.go:333
go/types.representableConst.func1({0x10501cc70?, 0x1054e47c0?})
	/usr/local/go/src/go/types/const.go:76 +0x9c

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Not code and just a doc.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.35%. Comparing base (bdd8736) to head (b6bdfd6).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1134   +/-   ##
=======================================
  Coverage   79.35%   79.35%           
=======================================
  Files         208      208           
  Lines       18335    18335           
=======================================
  Hits        14550    14550           
  Misses       3785     3785           

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[BalaBalaYi]

LGTM