lmdb: set MSRV to 1.70.0

Pull-Request: #993
Signed-off-by: Yuki Kishimoto <[email protected]>

Author: dcadenas

database/nostr-lmdb/CHANGELOG.md

@@ -25,6 +25,10 @@
 
 ## Unreleased
 
+### Changed
+
+- Set MSRV to 1.70.0 (https://github.com/rust-nostr/nostr/pull/993)
+
 ### Added
 
 - Add NostrLmdbBuilder and allow setting a custom map size (https://github.com/rust-nostr/nostr/pull/970)

database/nostr-lmdb/Cargo.toml

@@ -8,7 +8,7 @@ homepage.workspace = true
 repository.workspace = true
 license.workspace = true
 readme = "README.md"
-rust-version = "1.72.0"
+rust-version.workspace = true
 keywords = ["nostr", "database", "lmdb"]
 
 [dependencies]