### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current behaviour

crash/UB in https://github.com/bitcoin/bitcoin/blob/f0758d8a6696657269d9c057e7aa079ffa9e1c16/src/rpc/rawtransaction.cpp#L1906

### Expected behaviour

no crash

### Steps to reproduce

* Compile with ubsan
* `UBSAN_OPTIONS="suppressions=$(pwd)/test/sanitizer_suppressions/ubsan:print_stacktrace=1:halt_on_error=1:report_error_type=1" ./src/qt/bitcoin-qt`
* `analyzepsbt cHNidP8BACkgICAgAAEgICAgIP8DABYgICAgICAgICAgICAgICAgICAgICAgICAgIAAA`

### Relevant log output

```
    #0 0x55a94d97befd in CFeeRate::GetFee(unsigned int) const src/policy/feerate.cpp:29:63
    #1 0x55a94d4648ca in CFeeRate::GetFeePerK() const src/./policy/feerate.h:65:41
    #2 0x55a94d4648ca in analyzepsbt()::$_13::operator()(RPCHelpMan const&, JSONRPCRequest const&) const src/rpc/rawtransaction.cpp:1907:85
...
SUMMARY: UndefinedBehaviorSanitizer: signed-integer-overflow policy/feerate.cpp:29:63 in 
```

### How did you obtain Bitcoin Core

Compiled from source

### What version of Bitcoin Core are you using?

current master

### Operating system and version

Linux

### Machine specifications

_No response_
friend bool operator<(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK < b.nSatoshisPerK; }
    friend bool operator>(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK > b.nSatoshisPerK; }
    friend bool operator==(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK == b.nSatoshisPerK; }
    friend bool operator<=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK <= b.nSatoshisPerK; }
    friend bool operator>=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK >= b.nSatoshisPerK; }
    friend bool operator!=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK != b.nSatoshisPerK; }
    CFeeRate& operator+=(const CFeeRate& a) { nSatoshisPerK += a.nSatoshisPerK; return *this; }
    std::string ToString(const FeeEstimateMode& fee_estimate_mode = FeeEstimateMode::BTC_KVB) const;
    SERIALIZE_METHODS(CFeeRate, obj) { READWRITE(obj.nSatoshisPerK); }
};
#endif