Bump wrapper versions to 0.15.0

[G1gg1L3s]

Bump all of the wrapper versions according to our docs. Same parts of it are outdated while the other are a bit unclear for me, so I may miss something.

I've put the release day of July 1st, but it's more like a plug, we can adjust it on the go.

About the unclearness: I didn't get where to put the 0.15.0 tag on, so I skipped that.

Also, since I don't have MacOS machine, I didn't touch any of the Apple stuff, so I need help here.

Finally, I've update the React Native, though it's not documented. I also found that it uses 0.13.1 in some of its scripts, so the question is should we update it as well?

https://github.com/cossacklabs/themis/blob/d5154b0a8998ffa86e4dfe96b5927dc61baa711f/src/wrappers/themis/react-native-themis/android/build.gradle#L59

Checklist

Wrappers

• [x] Themis Core
• [x] Python
• [x] Ruby
• [x] NodeJs
• [x] Wasm
• [x] Android
• [ ] PHP (we deprecate it, right? Maybe do something with it or just update the changelog?)
• [x] Rust
• [ ] ObjC
• [x] React Native

Other

• [x] Changelog is updated
• [ ] The 0.15.0 tag points to the correct branch
• [ ] Documentation is updated[^1]
• [ ] Examples are update to use the new version[^1]

[^1]: Looking at the #883, I suspect that these are changed after the release. Though the changes can be prepared now. Correct me if I'm wrong.

[Lagovas]

I see, that

• Themis Core / MSYS2 environment (pull_request) - fails due to it expects 0.15.0 tar.gz from github and probably will be fixed after pushing tag
• Themis Core / Benchmarks (pull_request) - looks like the same, rust cannot find code with expected version
• RustThemis / libthemis-sys bindings (pull_request) - looks like we should re-generate some bindings for rust
• RustThemis / Code examples (1.58) (pull_request) - some rust examples (comparator?) expect 0.14.0 themis as dependency. +1 place where we should keep in mind to up version?

[G1gg1L3s]

So, RustThemis is fixed - I somehow forgot to update benchmarks, though I remember doing it... Anyway, fixes of the libthemis-sys are in #1008. I will merge them here when PR is approved but they are probably okay.

So yeah, the other checks fail because they expect packages that we haven't released yet.