fix: make rxjs version dynamic to support newest versions of Angular

[NachoVazquez]

PR Checklist

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• The commit message follows our guidelines: CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[x] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

RxJS version is fixed at version 7.5.0, which makes it incompatible with the newest version of Angular.

What is the new behavior?

RxJS peerDependency is set to support versions between >= 7.5.0 and < 8.0.0

Does this PR introduce a breaking change?

[ ] Yes
[x] No

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