Update MSRV: 1.60.0 -> 1.64.0

We depend on temp_env in our tests, which got an update that bumps its
own MSRV to 1.64.0.
Thus, we need to update to 1.64.0 or pin temp_env to an older version.
We opt for the former.

Signed-off-by: Matthias Beyer <[email protected]>

Author: matthiasbeyer

.github/workflows/cron.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.60.0
+          - 1.64.0
           - stable
 
     steps:

.github/workflows/msrv.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.60.0
+          - 1.64.0
           - stable
           - beta
           - nightly
@@ -39,7 +39,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.60.0
+          - 1.64.0
           - stable
           - beta
           - nightly
@@ -57,7 +57,7 @@ jobs:
         run: cargo test --all-features
 
       - name: Run cargo test (nightly)
-        if: matrix.rust == '1.60.0'
+        if: matrix.rust == '1.64.0'
         continue-on-error: true
         run: cargo test --tests --all-features
 
@@ -95,7 +95,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.60.0
+          - 1.64.0
           - stable
     steps:
       - name: Checkout sources
@@ -117,7 +117,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.60.0
+          - 1.64.0
           - stable
 
     steps:

README.md

@@ -58,7 +58,7 @@ more usage information.
 
 ## MSRV
 
-We currently support Rust 1.60.0 and newer.
+We currently support Rust 1.64.0 and newer.
 
 
 ## License