nix

Set version to 2.6.0-rc2 #8755

Job	Run time
dependencies (linux, gcc, Debug)	1m 55s
dependencies (linux, clang, Release)	1m 29s
dependencies (linux, clang, Debug)	1m 50s
dependencies (linux, gcc, Release)	1m 13s
conan	2m 18s
reference-fee-test (linux, gcc, Debug, -DUNIT_TEST_REFERENCE_FEE=1000)	11m 57s
reference-fee-test (linux, gcc, Debug, -DUNIT_TEST_REFERENCE_FEE=200)	11m 50s
coverage (linux, gcc, Debug)	16m 26s
test (linux, gcc, Debug, -Dunity=ON)	8m 12s
test (linux, clang, Debug)	8m 53s
test (linux, gcc, Release)	13m 29s
test (linux, gcc, Debug)	12m 0s
test (linux, clang, Release, -Dunity=ON)	8m 25s
test (linux, clang, Debug, -Dunity=ON)	6m 1s
test (linux, gcc, Release, -Dunity=ON)	8m 44s
test (linux, clang, Release)	11m 12s
instrumentation-build	18m 27s
	2h 24m 21s

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