Fix links for gcp 2.5.0 changelog

[endorama]

Fix the PR links in changelog added with PR #3986

[elasticmachine]

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• Start Time: 2022-08-16T08:22:29.502+0000

• Duration: 20 min 20 sec

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Test	Results
Failed	0
Passed	69
Skipped	0
Total	69

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (4/4)	💚
Files	100.0% (4/4)	💚 2.879
Classes	100.0% (4/4)	💚 2.879
Methods	92.857% (65/70)	👍 2.799
Lines	95.443% (1173/1229)	👍 3.617
Conditionals	100.0% (0/0)	💚