feat!: new quic-rpc, simlified generics, bump MSRV to 1.76 (#2268)

## Description

Adapts iroh for n0-computer/quic-rpc#76

Wit this change, a quic client is
`pub type QuicIroh = Iroh<QuinnConnection<RpcService>>`
instead of
`pub type QuicIroh = Iroh<QuinnConnection<ProviderRequest,
ProviderResponse>>`

## Breaking Changes
* Increased mimimal supported rust version (MSRV) from 1.75 to 1.76
* The generics of the iroh clients changed: Instead of taking
`ProviderRequest, ProviderResponse` as generics, they now take
`RpcService`

## Notes & open questions

<!-- Any notes, remarks or open questions you have to make about the PR.
-->

## Change checklist

- [x] Self-review.
- [x] Documentation updates if relevant.
- [x] Tests if relevant.
- [x] All breaking changes documented.

---------

Co-authored-by: dignifiedquire <[email protected]>

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ env:
   RUST_BACKTRACE: 1
   RUSTFLAGS: -Dwarnings
   RUSTDOCFLAGS: -Dwarnings
-  MSRV: "1.75"
+  MSRV: "1.76"
   SCCACHE_CACHE_SIZE: "50G"
 
 jobs:

.github/workflows/release.yml

@@ -27,7 +27,7 @@ env:
   RUST_BACKTRACE: 1
   RUSTFLAGS: -Dwarnings
   RUSTDOCFLAGS: -Dwarnings
-  MSRV: "1.75"
+  MSRV: "1.76"
   SCCACHE_CACHE_SIZE: "50G"
   BIN_NAMES: "iroh,iroh-relay,iroh-dns-server"
   RELEASE_VERSION: ${{ github.event.inputs.release_version }}

.github/workflows/test_relay_server.yml

@@ -13,7 +13,7 @@ env:
     RUST_BACKTRACE: 1
     RUSTFLAGS: -Dwarnings
     RUSTDOCFLAGS: -Dwarnings
-    MSRV: "1.75"
+    MSRV: "1.76"
     SCCACHE_CACHE_SIZE: "50G"
 
 jobs: