nix

Set version to 2.6.0 #8805

Job	Run time
dependencies (linux, gcc, Release)	2m 32s
dependencies (linux, clang, Debug)	1m 58s
dependencies (linux, gcc, Debug)	2m 59s
dependencies (linux, clang, Release)	2m 28s
reference-fee-test (linux, gcc, Debug, -DUNIT_TEST_REFERENCE_FEE=200)	13m 4s
coverage (linux, gcc, Debug)	17m 39s
reference-fee-test (linux, gcc, Debug, -DUNIT_TEST_REFERENCE_FEE=1000)	12m 38s
instrumentation-build	19m 19s
conan	2m 49s
test (linux, gcc, Debug, -Dunity=ON)	8m 9s
test (linux, clang, Debug)	9m 45s
test (linux, gcc, Release)	14m 24s
test (linux, gcc, Debug)	14m 2s
test (linux, clang, Release)	12m 14s
test (linux, clang, Debug, -Dunity=ON)	6m 58s
test (linux, gcc, Release, -Dunity=ON)	8m 51s
test (linux, clang, Release, -Dunity=ON)	9m 22s
	2h 39m 11s

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