Clean deprecation warnings

[miguelmaso]

Removed deprecation warnings from test and benchmark files

[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	main	7bbd2f5...	main / 7bbd2f5...
Constitutive models/Visco-elastic Ψ	0.033 ± 0.015 ms	0.0323 ± 0.015 ms	1.02 ± 0.65
Constitutive models/Visco-elastic ∂Ψu	26.5 ± 3 μs	26.5 ± 2.7 μs	0.999 ± 0.15
Constitutive models/Visco-elastic ∂Ψuu	0.0501 ± 0.028 ms	0.0494 ± 0.028 ms	1.01 ± 0.8
Simulations/StaticMechanicalDirichlet	0.109 ± 0.0035 s	0.11 ± 0.0055 s	0.99 ± 0.059
Simulations/StaticMechanicalNeumann	0.0987 ± 0.016 s	0.0995 ± 0.015 s	0.992 ± 0.22
Simulations/ViscoElastic	10 s	10.2 s	0.988
Tensor algebra/Cofactor	0.06 ± 0 μs	0.06 ± 0.01 μs	1 ± 0.17
Tensor algebra/Det(A)Inv(A')	0.1 ± 0.01 μs	0.1 ± 0.02 μs	1 ± 0.22
Tensor algebra/δδ_λ_2d	20 ± 10 ns	20 ± 10 ns	1 ± 0.71
Tensor algebra/δδ_μ_2d	20 ± 10 ns	20 ± 10 ns	1 ± 0.71
time_to_load	2.31 ± 0.034 s	2.3 ± 0.0017 s	1 ± 0.015

Memory benchmarks

	main	7bbd2f5...	main / 7bbd2f5...
Constitutive models/Visco-elastic Ψ	0.542 k allocs: 0.0443 MB	0.542 k allocs: 0.0443 MB	1
Constitutive models/Visco-elastic ∂Ψu	0.593 k allocs: 0.0492 MB	0.593 k allocs: 0.0492 MB	1
Constitutive models/Visco-elastic ∂Ψuu	1.02 k allocs: 0.0839 MB	1.02 k allocs: 0.0839 MB	1
Simulations/StaticMechanicalDirichlet	1.51 M allocs: 0.108 GB	1.51 M allocs: 0.108 GB	1
Simulations/StaticMechanicalNeumann	1.48 M allocs: 0.0927 GB	1.48 M allocs: 0.0927 GB	1
Simulations/ViscoElastic	0.162 G allocs: 12.7 GB	0.162 G allocs: 12.7 GB	1
Tensor algebra/Cofactor	1 allocs: 0.0781 kB	1 allocs: 0.0781 kB	1
Tensor algebra/Det(A)Inv(A')	4 allocs: 0.25 kB	4 allocs: 0.25 kB	1
Tensor algebra/δδ_λ_2d	0 allocs: 0 B	0 allocs: 0 B
Tensor algebra/δδ_μ_2d	0 allocs: 0 B	0 allocs: 0 B
time_to_load	0.149 k allocs: 11.1 kB	0.149 k allocs: 11.1 kB	1