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Fixed and More Consistent Pragmas (#458)

Fixes
https://github.com/hats-finance/Safe-0x2909fdefd/issues/17

This PR changes the pragmas in the passkeys contract to be:
1. More consistent: we use `^0.8.20` everywhere for "non-top-level"
contracts. The version was chosen as this it the first version that
supports all of the compiler features that we make use of. Notably, we
have `@custom:` NatSpec items which are only officially supported as of
v0.8.20 (incidentally, this is the same version used by OpenZeppelin
contracts for similar reason:
[source](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4489)).
The choice to use floating pragmas here is to make using these support
contracts easier across other projects (namely, the `WebAuthn` and
`P256` libraries are useful outside of this project). Furthermore, we
use `^` versions so that breaking changes introduced in a potential
Solidity v0.9 would not affect the security and integrity of the
contract code.
2. Use fixed pragmas for "top-level" contracts that we deploy:
    - `SafeWebAuthnProxyFactory`
    - `SafeWebAuthnSharedSigner`
    - `FCLP256Verifier`

I am aware that Solidity v0.8.20 doesn't play nice with chains like BNB
by default, however this can be worked around by explicitly by setting
the EVM version target (as we do in this project) and do not believe
this is an issue.

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