Fix type instabilities in ADNLPModels.jl #633

Job	Run time
Julia pre - windows-latest - x64 - pull_request	56m 17s
Julia pre - ubuntu-latest - x64 - pull_request	54m 17s
Julia 1 - macos-latest - x64 - pull_request	1h 30m 17s
Julia lts - macos-latest - x64 - pull_request	34m 20s
Julia 1 - ubuntu-24.04-arm - arm64 - pull_request	54m 33s
Julia 1 - macos-15-intel - x64 - pull_request	1h 9m 12s
Julia 1 - macos-latest - arm64 - pull_request	41m 38s
Julia pre - macos-latest - x64 - pull_request	50m 32s
Julia lts - ubuntu-latest - x64 - pull_request	33m 18s
Julia 1 - windows-latest - x64 - pull_request	58m 10s
Julia 1 - ubuntu-latest - x64 - pull_request	50m 38s
Julia lts - windows-latest - x64 - pull_request	37m 38s
Julia lts - macos-15-intel - x64 - pull_request	55m 59s
	11h 26m 49s

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