Updgrade dependencies and pin for MSRV

Currently, after upgrading `bitcoin` the MSRV build no longer works
because of dependency issues. I'm a little confused by them but the
following seems to fix it:

- Upgrade minimum dependency patch version number for `serde` and
  `serde_json`.

- Upgrade the dev dependency minor version for `tempfile`.

- In CI for the MSRV build pin some crate versions.

client/Cargo.toml

@@ -25,9 +25,9 @@ log = "0.4.5"
 jsonrpc = "0.14.0"
 
 # Used for deserialization of JSON.
-serde = "1"
-serde_json = "1"
+serde = "1.0.156"
+serde_json = "1.0.96"
 
 [dev-dependencies]
-tempfile = "3.3.0"
+tempfile = "3.6.0"
 

contrib/run_task.sh

@@ -59,6 +59,7 @@ main() {
             ;;
 
 	msrv)
+            do_msrv_pins
             build_and_test "+$MSRV"
             ;;
 
@@ -86,6 +87,15 @@ build_and_test() {
     cargo "$toolchain" test --workspace
 }
 
+# Pin dependencies to get the MSRV build to work.
+do_msrv_pins() {
+    cargo update -p tempfile --precise 3.6.0
+    cargo update -p cc --precise 1.0.79
+    cargo update -p log --precise 0.4.18
+    cargo update -p serde_json --precise 1.0.96
+    cargo update -p serde --precise 1.0.156
+}
+
 # Check the workspace formatting.
 do_fmt() {
     cargo +stable fmt --all --check

json/Cargo.toml

@@ -20,7 +20,7 @@ name = "bitcoincore_rpc_json"
 path = "src/lib.rs"
 
 [dependencies]
-serde = { version = "1", features = [ "derive" ] }
-serde_json = "1"
+serde = { version = "1.0.156", features = [ "derive" ] }
+serde_json = "1.0.96"
 
 bitcoin = { version = "0.32.0", features = ["serde", "rand-std"]}