gclient2nix: update, fix for electron_38

Fixes error:

```
File "/nix/store/x95xf16qsvblyxgcag1fqmrsqm7px6rk-depot_tools-452fe3b/gclient_eval.py", line 643, in _convert
raise ValueError('invalid "and" operand %r (inside %r)' %
ValueError: invalid "and" operand 'checkout_riscv64' (inside 'checkout_linux and checkout_riscv64 and non_git_source')
```

teutat3s 62d173f9 5ec4ede6

Changed files
+3 -3
pkgs
by-name
gc
+1 -1
pkgs/by-name/gc/gclient2nix/gclient2nix.py
···
},
**{
f"checkout_{arch}": True
-
for arch in ["x64", "arm64", "arm", "x86", "mips", "mips64", "ppc"]
+
for arch in ["x64", "arm64", "arm", "x86", "mips", "mips64", "ppc", "riscv64"]
},
},
"",
+2 -2
pkgs/by-name/gc/gclient2nix/package.nix
···
# substitutions
depot_tools_checkout = fetchgit {
url = "https://chromium.googlesource.com/chromium/tools/depot_tools";
-
rev = "452fe3be37f78fbecefa1b4b0d359531bcd70d0d";
-
hash = "sha256-8IiJOm0FLa/u1Vd96tb33Ruj4IUTCeYgBpTk88znhPw=";
+
rev = "fa63ec7437108dcb3a611c6a6c5f3d96771e9581";
+
hash = "sha256-hRIwhIdRF2GbyXbpOdi/lla+/XYM+gKosoK+T+kYYu0=";
};
passthru = {