Test

Add `data_ptr` method to `Vips::Image` #203

Job	Run time
Lint	48s
Functional testing (ubuntu-24.04, 2.4)	35s
Functional testing (ubuntu-24.04, 2.3)	36s
Functional testing (ubuntu-24.04, 2.6)	44s
Functional testing (ubuntu-24.04, 2.5)	38s
Functional testing (ubuntu-24.04, jruby)	1m 4s
Functional testing (ubuntu-24.04, 3.1)	39s
Functional testing (ubuntu-24.04, 3.0)	57s
Functional testing (ubuntu-24.04, 3.2)	38s
Functional testing (ubuntu-24.04, 2.7)	52s
Functional testing (ubuntu-24.04, 3.3)	41s
	8m 12s

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