Flux 1.13.3

This is a patch release, mostly concerned with adapting documentation to Flux's new home in https://github.com/fluxcd/ and the CNCF sandbox.

Fixes

• Correct the name of the --registry-require argument mentioned in a log message fluxcd/flux#2256
• Parse Docker credentials that have a host and port, but not a scheme fluxcd/flux#2248

Maintenance and documentation

• Change references to weaveworks/flux to fluxcd/flux fluxcd/flux#2240, fluxcd/flux#2244, fluxcd/flux#2257, fluxcd/flux#2271
• Add Walmart to production users (:tada:!) fluxcd/flux#2268
• Mention the multi-tenancy tutorial in the README fluxcd/flux#2286
• Fix the filename given in the .flux.yaml (manifest generation) docs fluxcd/flux#2270
• Run credentials tests in parallel, without sleeping fluxcd/flux#2254
• Correct the Prometheus annotations given in examples fluxcd/flux#2278

Thanks

Thanks to the following for contributions since the last release: @2opremio, @aaron-trout, @adusumillipraveen, @alexhumphreys, @aliartiza75, @ariep, @binjheBenjamin, @bricef, @caniszczyk, @carlosjgp, @carlpett, @chriscorn-takt, @cloudoutloud, @derrickburns, @dholbach, @fnmeissner, @gled4er, @hiddeco, @jmtrusona, @jowparks, @jpellizzari, @ksaritek, @ktsakalozos, @mar1n3r0, @mzachh, @primeroz, @squaremo, @stefanprodan, @sureshamk, @vyckou, @ybaruchel, @zoni.