RLS: add v1.5.0 release notes #315

Job	Run time
test-linux-macos (3.9, ubuntu-22.04)	56s
test-windows (3.9, x86, windows-latest)	1m 25s
test-pyversions (3.9)	55s
test-windows (3.9, x86, windows-2019)	1m 19s
test-pyversions (3.10)	51s
test-windows (3.9, x64, windows-latest)	2m 12s
test-linux-macos (3.9, ubuntu-24.04-arm)	1m 5s
test-pyversions (3.11)	49s
test-linux-macos (3.9, macos-13)	1m 16s
test-pyversions (3.12)	51s
test-linux-macos (3.9, macos-latest)	50s
test-pyversions (3.13)	54s
test-windows (3.9, x64, windows-2019)	1m 26s
test-linux-macos (3.13, ubuntu-22.04)	53s
test-pyversions (3.13t)	1m 11s
test-windows (3.13, x86, windows-latest)	2m 10s
test-linux-macos (3.13, ubuntu-24.04-arm)	1m 9s
test-windows (3.13, x86, windows-2019)	1m 37s
test-linux-macos (3.13, macos-13)	1m 33s
test-windows (3.13, x64, windows-latest)	2m 1s
test-linux-macos (3.13, macos-latest)	33s
test-windows (3.13, x64, windows-2019)	1m 50s
test-windows (3.13t, x86, windows-latest)	3m 48s
test-windows (3.13t, x86, windows-2019)	4m 26s
test-windows (3.13t, x64, windows-latest)	2m 27s
test-windows (3.13t, x64, windows-2019)	5m 20s
check	1s
build_wheels	0s
build_sdist	0s
release	0s
	43m 48s

Provide feedback