nix

Set version to 2.6.0-rc2 #8759

Job	Run time
dependencies (linux, gcc, Release)	1m 8s
dependencies (linux, gcc, Debug)	1m 50s
dependencies (linux, clang, Debug)	1m 34s
dependencies (linux, clang, Release)	1m 18s
coverage (linux, gcc, Debug)	15m 54s
reference-fee-test (linux, gcc, Debug, -DUNIT_TEST_REFERENCE_FEE=200)	12m 1s
reference-fee-test (linux, gcc, Debug, -DUNIT_TEST_REFERENCE_FEE=1000)	11m 42s
instrumentation-build	18m 22s
test (linux, clang, Debug)	9m 2s
test (linux, gcc, Debug, -Dunity=ON)	7m 47s
conan	2m 22s
test (linux, gcc, Debug)	11m 46s
test (linux, gcc, Release)	13m 44s
test (linux, gcc, Release, -Dunity=ON)	8m 41s
test (linux, clang, Release)	11m 1s
test (linux, clang, Release, -Dunity=ON)	8m 15s
test (linux, clang, Debug, -Dunity=ON)	5m 53s
	2h 22m 20s

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