Draft: Revert "Fix compilation with fmtlib < 8"

This reverts a commit that was squashed in !1455 (merged) (a9a4cad9).

Closes #268 (closed)

changed milestone to %v37r0

added 26 commits

• b5815c7c...ba821e82 - 25 commits from branch master
• d7402657 - Revert "Fix compilation with fmtlib < 8"

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added 13 commits

• d7402657...4784576d - 12 commits from branch master
• 95444a23 - Revert "Fix compilation with fmtlib < 8"

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removed milestone %v37r0

We have to wait we drop support for LCG 102.

marked this merge request as draft

changed milestone to %v38r0

added 168 commits

• 95444a23...92b5aa2f - 167 commits from branch master
• 77cc6e0a - Revert "Fix compilation with fmtlib < 8"

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removed milestone %v38r0

Superseded by !1630 (merged)

closed