Allow `psr/log` 2.0 & 3.0

[j0k3r]

Should fix #76

Also:

• remove config>platform>php which was locking psr/log to 1.0 because of the PHP version from that config.
• lock php version for cs-fixer
• upgrade GitHub Actions to latest

[coveralls]

Pull Request Test Coverage Report for Build 3268459326

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 84.485%

---

Totals
Change from base Build 2486672970:	0.0%
Covered Lines:	599
Relevant Lines:	709

---

💛 - Coveralls