Bump MSRV to 1.65 for proptest

Author: Jean Commère

.github/workflows/checking.yml

@@ -10,7 +10,7 @@ jobs:
       fail-fast: false
       matrix:
         toolchain: 
-          - 1.64.0
+          - 1.65.0
           - stable
           - nightly
         os:

.github/workflows/codequality.yml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       matrix:
         toolchain:
-          - 1.64.0
+          - 1.65.0
           - stable
 
     steps:

.github/workflows/testing.yml

@@ -11,7 +11,7 @@ jobs:
       fail-fast: false
       matrix:
         toolchain:
-          - 1.64.0
+          - 1.65.0
           - stable
         os:
           - ubuntu-18.04

Cargo.toml

@@ -7,7 +7,7 @@ license = "MIT/Apache-2.0"
 readme = "README.md"
 description = "Pure-Rust implementation of linear algebra routines for ndarray"
 repository = "https://github.com/rust-ml/linfa-linalg"
-rust-version = "1.64"
+rust-version = "1.65"
 
 keywords = ["ndarray", "matrix", "linalg"]
 categories = ["algorithms", "mathematics", "science"]