fix: bump msrv (closes #532)

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -51,7 +51,7 @@ body:
     id: language-version
     attributes:
       label: Rust version
-      placeholder: Our MSRV is 1.68.0
+      placeholder: Our MSRV is 1.74.0
     validations:
       required: true
   - type: input

.github/workflows/async-stripe.yml

@@ -111,7 +111,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: "1.68.0"
+          toolchain: "1.74.0"
           override: true
       - uses: actions/cache@v2
         with:

Cargo.toml

@@ -9,7 +9,7 @@ members = [
 name = "async-stripe"
 version = "0.35.0"
 description = "API bindings for the Stripe HTTP API"
-rust-version = "1.68.0"
+rust-version = "1.74.0"
 authors = [
   "Anna Baldwin <abaldwin@developers.wyyerd.com>",
   "Kevin Stenerson <kestred@users.noreply.github.com>",

README.md

@@ -61,7 +61,7 @@ If you don't see the specific version you are on, prefer the next available vers
 
 ## MSRV
 
-We currently have `1.68.0` pinned in CI, so any version of rustc newer than that should work.
+We currently have `1.74.0` pinned in CI, so any version of rustc newer than that should work.
 If this is not the case, please open an issue. As a policy, we permit MSRV increases in non-breaking releases.
 If you have a compelling usecase for bumping it, we are usually open to do so, as long as
 the rust version is not too new (generally 3 releases).