Bump NEST Simulator version to 3.7_rc1

Release candidate for upcoming NEST 3.7

added 1 commit

• 858ca712 - Bump NEST Simulator version to 3.7_rc1

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added 10 commits

• 858ca712...407893ff - 8 commits from branch technical-coordination/project-internal/devops/platform:master
• 2d97b888 - Merge branch 'master' into update-nest-version
• f63323a7 - Use NEST 3.7_rc1 in spack.yaml

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merged