Silence a warning from the REUSE linter; update tested compilers

[johnsonjh]

• Silence a warning from the REUSE linter
• While here, update tested compilers

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[coveralls]

Pull Request Test Coverage Report for Build 1722

Details

• 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 95.493%

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Totals
Change from base Build 1721:	0.0%
Covered Lines:	3877
Relevant Lines:	4060

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💛 - Coveralls