Add back -trunk version tag after 0.26.0 release

[msimberg]

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Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.11% (target: -1.00%)	✅ ∅ (target: 90.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (838e3dd)	18541	13884	74.88%
Head commit (8bf5767)	18541 (+0)	13863 (-21)	74.77% (-0.11%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1199)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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