Account for fully-qualified path case of conflicting crate versions

When encountering the following, mention the precense of conflicting crates:

```
error[E0599]: no function or associated item named `get_decoded` found for struct `HpkeConfig` in the current scope
   --> src/main.rs:7:17
    |
7   |     HpkeConfig::get_decoded(&foo);
    |                 ^^^^^^^^^^^ function or associated item not found in `HpkeConfig`
    |
note: if you're trying to build a new `HpkeConfig`, consider using `HpkeConfig::new` which returns `HpkeConfig`
   --> ~/.cargo/registry/src/index.crates.io-6f17d22bba15001f/janus_messages-0.3.1/src/lib.rs:908:5
    |
908 | /     pub fn new(
909 | |         id: HpkeConfigId,
910 | |         kem_id: HpkeKemId,
911 | |         kdf_id: HpkeKdfId,
912 | |         aead_id: HpkeAeadId,
913 | |         public_key: HpkePublicKey,
914 | |     ) -> HpkeConfig {
    | |___________________^
note: there are multiple different versions of crate `prio` in the dependency graph
   --> src/main.rs:1:5
    |
1   | use prio::codec::Decode;
    |     ^^^^^^^^^^^^^^^^^^^ `prio` imported here doesn't correspond to the right crate version
    |
   ::: ~/.cargo/registry/src/index.crates.io-6f17d22bba15001f/prio-0.9.1/src/codec.rs:35:1
    |
35  | pub trait Decode: Sized {
    | ----------------------- this is the trait that was imported
    |
   ::: ~/.cargo/registry/src/index.crates.io-6f17d22bba15001f/prio-0.10.3/src/codec.rs:35:1
    |
35  | pub trait Decode: Sized {
    | ----------------------- this is the trait that is needed
...
43  |     fn get_decoded(bytes: &[u8]) -> Result<Self, CodecError> {
    |     -------------------------------------------------------- the method is available for `HpkeConfig` here
help: there is an associated function `decode` with a similar name
    |
7   |     HpkeConfig::decode(&foo);
    |                 ~~~~~~
```

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