Revert h2 upgrade (#15079)

## Summary

While we figure out what's going on in
hyperium/h2#856.

Closes #15056.

Author: charliermarsh

Cargo.lock

@@ -112,6 +112,7 @@ glob = { version = "0.3.1" }
 globset = { version = "0.4.15" }
 globwalk = { version = "0.9.1" }
 goblin = { version = "0.10.0", default-features = false, features = ["std", "elf32", "elf64", "endian_fd"] }
+h2 = { version = "<=0.4.7" }
 hashbrown = { version = "0.15.1" }
 hex = { version = "0.4.3" }
 home = { version = "0.5.9" }
@@ -213,7 +214,7 @@ test-log = { version = "0.2.16", features = ["trace"], default-features = false
 whoami = { version = "1.6.0" }
 
 [workspace.metadata.cargo-shear]
-ignored = ["flate2", "xz2"]
+ignored = ["flate2", "xz2", "h2"]
 
 [workspace.lints.rust]
 unsafe_code = "warn"

Cargo.toml

@@ -85,6 +85,7 @@ owo-colors = { workspace = true }
 petgraph = { workspace = true }
 regex = { workspace = true }
 reqwest = { workspace = true }
+h2 = { workspace = true }
 rkyv = { workspace = true }
 rustc-hash = { workspace = true }
 serde = { workspace = true }
@@ -138,6 +139,7 @@ nix = { workspace = true }
 [package.metadata.cargo-shear]
 ignored = [
     "flate2",
+    "h2",
     "uv-performance-memory-allocator",
 ]