Feature/update gfortran version #616

Job	Run time
mmg-debug / ci (ubuntu-20.04, on, off, on, off, int32_t)	1h 16m 1s
mmg-debug / ci (ubuntu-20.04, on, off, off, off, int32_t)	1h 38m 11s
mmg-debug / ci (ubuntu-20.04, off, off, on, off, int32_t)	1h 1m 53s
mmg-debug / ci (ubuntu-20.04, off, off, off, off, int32_t)	1h 15m 48s
mmg-debug / ci (macos-12, on, off, on, off, int32_t)	39m 34s
mmg-debug / ci (macos-12, on, off, off, off, int32_t)	57m 26s
mmg-debug / ci (macos-12, off, off, on, off, int32_t)	42m 45s
mmg-debug / ci (macos-12, off, off, off, off, int32_t)	44m 37s
mmg-debug / ci (ubuntu-20.04, off, off, off, on, int32_t)	3m 56s
mmg-debug / ci (macos-12, off, off, off, on, int32_t)	8m 50s
mmg-debug / ci (ubuntu-20.04, off, on, on, off, int32_t)	1h 1m 5s
mmg-debug / ci (macos-12, off, on, on, off, int32_t)	38m 26s
mmg-debug / ci (windows-2022, off, off, off, off, int32_t)	56m 59s
mmg-debug / ci (windows-2022, on, off, off, off, int32_t)	53m 4s
mmg-debug / ci (windows-2022, off, on, off, off, int32_t)	51m 46s
mmg-debug / ci (ubuntu-20.04, on, on, on, on, int64_t)	5m 2s
mmg-debug / ci (ubuntu-20.04, off, off, on, on, int64_t)	1h 7m 45s
mmg-debug / ci (ubuntu-20.04, off, off, off, off, int64_t)	1m 49s
mmg-debug / ci (macos-12, on, on, on, on, int64_t)	7m 30s
mmg-debug / ci (macos-12, off, off, off, off, int64_t)	3m 56s
mmg-debug / ci (windows-2022, on, on, off, off, int64_t)	4m 20s
mmg-debug / ci (windows-2022, off, off, off, off, int64_t)	4m 23s
mmg-debug / upload_coverage	1m 31s
	14h 26m 37s

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