v0.66

This release fixes a bug causing silences to be created twice (or more) when using new silence form (#1878).

Full changelog:

• #1899 - feat(ui): show simplified status for single cluster silence submits
• #1898 - fix(api): return label color data as rgba strings
• #1897 - fix(ui): handle canceled get requests in silence form
• #1896 - fix(build): only install dev dependencies when needed
• #1895 - fix(ui): reset failed ack button after 20s
• #1894 - fix(ui): move silence request state off component
• #1893 - feat(tests): add looppointer linter
• #1883 - fix(docker): use alpine 3.12 for Go docker
• #1882 - fix(api): ensure stable sort order when group is repeated
• #1880 - fix(ui): avoid updates on silence components re-rerenders
• #1877 - fix(tests): fix tested file extensions
• #1876 - fix(ui): use react-media-hook instead of react-media