Nat hole punching for discv5.2

.github/workflows/build.yml

@@ -6,7 +6,7 @@ jobs:
   cargo-fmt:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Get latest version of stable rust
         run: rustup update stable
       - name: Check formatting with cargofmt
@@ -15,18 +15,18 @@ jobs:
     runs-on: ubuntu-latest
     needs: cargo-fmt
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Get latest version of stable rust
         run: rustup update stable
       - name: Install protobuf compiler for the libp2p-core dependency
         uses: arduino/setup-protoc@v1
       - name: Lint code for quality and style with Clippy
-        run: cargo clippy --workspace --tests --all-features -- -D warnings
+        run: cargo clippy --workspace --tests --all-features -- -D warnings -A clippy::assertions_on_constants 
   release-tests-ubuntu:
     runs-on: ubuntu-latest
     needs: cargo-fmt
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Get latest version of stable rust
         run: rustup update stable
       - name: Run tests in release
@@ -37,21 +37,32 @@ jobs:
       image: rust
     needs: cargo-fmt
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Get latest version of stable rust
         run: rustup update stable
       - name: Install protobuf compiler for the libp2p-core dependency
         uses: arduino/setup-protoc@v1
       - name: Run tests in release
-        run: cargo test --all --release --all-features
+        run: cargo test --all --release --all-features -- --skip ipv6 #  ipv6 tests don't run in github ci https://github.com/actions/runner-images/issues/668  
   check-rustdoc-links:
     name: Check rustdoc intra-doc links
     runs-on: ubuntu-latest
     container:
       image: rust
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Get latest version of stable rust
         run: rustup update stable
       - name: Check rustdoc links
-        run: RUSTDOCFLAGS="--deny broken_intra_doc_links" cargo doc --verbose --workspace --no-deps --document-private-items
+        run: RUSTDOCFLAGS="--deny rustdoc::broken_intra_doc_links" cargo doc --verbose --workspace --no-deps --document-private-items
+  cargo-udeps:
+    runs-on: ubuntu-latest
+    needs: cargo-fmt
+    steps:
+      - uses: actions/checkout@v3
+      - name: Get latest version of nightly Rust
+        run: rustup update nightly
+      - name: Install cargo-udeps
+        run: cargo install cargo-udeps --locked
+      - name: Run cargo udeps to identify unused crates in the dependency graph
+        run: cargo +nightly udeps --tests --all-targets --release