- Disable some tests for some platforms:
* SFML tests/buildrequires are removed to simplify having the same
version in all repositories (SLE, backports, etc.).
* Disable test "tests/arc/tasyncorc.nim", which is failing in
ppc64le (backports).
- Require/recommend NodeJS 12 only where it is provided, so the
package is buildable on more codestreams.

- Includes upstream fixes for:
* (bsc#1175333, CVE-2020-15693) httpClient is vulnerable to a
CR-LF injection
* (bsc#1175334, CVE-2020-15692) mishandle of argument to
browsers.openDefaultBrowser
* (bsc#1175332, CVE-2020-15694) httpClient.get().contentLength()
fails to properly validate the server response
* (bsc#1192712, CVE-2021-41259) null byte accepted in getContent
function, leading to URI validation bypass
* (bsc#1185948, CVE-2021-29495) stdlib httpClient does not
validate peer certificates by default
* (bsc#1185085, CVE-2021-21374) Improper verification of the
SSL/TLS certificate
* (bsc#1185084, CVE-2021-21373) "nimble refresh" falls back to a
non-TLS URL in case of error
* (bsc#1185083, CVE-2021-21372) doCmd can be leveraged to execute
arbitrary commands
* (bsc#1181705, CVE-2020-15690) Standard library asyncftpclient
lacks a check for newline character