backup: Demote env_logger to only being required to run the validator

It has to be a full dependency and not just a dev-dependency because
the validator binary is a bin and not just an example, but it doesn't
need to be built *all* the time.

Author: jrose-signal

acknowledgments/acknowledgments-android-testing.md

@@ -5804,7 +5804,7 @@ THE SOFTWARE.
 
 ```
 
-## anstream 0.6.18, anstyle-query 1.1.2, clap 4.5.35, colorchoice 1.0.3, env_filter 0.1.3, env_logger 0.11.8, is_terminal_polyfill 1.70.1, toml_datetime 0.6.8, toml_edit 0.22.24
+## anstream 0.6.18, anstyle-query 1.1.2, clap 4.5.35, colorchoice 1.0.3, is_terminal_polyfill 1.70.1, toml_datetime 0.6.8, toml_edit 0.22.24
 
 ```
 Copyright (c) Individual contributors
@@ -6701,7 +6701,7 @@ THE SOFTWARE.
 
 ```
 
-## aho-corasick 1.1.3, jiff 0.2.5, memchr 2.7.4, walkdir 2.5.0
+## aho-corasick 1.1.3, memchr 2.7.4, walkdir 2.5.0
 
 ```
 The MIT License (MIT)

acknowledgments/acknowledgments-android.md

@@ -5804,7 +5804,7 @@ THE SOFTWARE.
 
 ```
 
-## anstream 0.6.18, anstyle-query 1.1.2, clap 4.5.35, colorchoice 1.0.3, env_filter 0.1.3, env_logger 0.11.8, is_terminal_polyfill 1.70.1, toml_datetime 0.6.8, toml_edit 0.22.24
+## anstream 0.6.18, anstyle-query 1.1.2, clap 4.5.35, colorchoice 1.0.3, is_terminal_polyfill 1.70.1, toml_datetime 0.6.8, toml_edit 0.22.24
 
 ```
 Copyright (c) Individual contributors
@@ -6701,7 +6701,7 @@ THE SOFTWARE.
 
 ```
 
-## aho-corasick 1.1.3, jiff 0.2.5, memchr 2.7.4, walkdir 2.5.0
+## aho-corasick 1.1.3, memchr 2.7.4, walkdir 2.5.0
 
 ```
 The MIT License (MIT)

acknowledgments/acknowledgments-desktop.md

@@ -6051,7 +6051,7 @@ SOFTWARE.
 
 ```
 
-## anstream 0.6.18, anstyle-query 1.1.2, clap 4.5.35, colorchoice 1.0.3, env_filter 0.1.3, env_logger 0.11.8, is_terminal_polyfill 1.70.1, toml_datetime 0.6.8, toml_edit 0.22.24
+## anstream 0.6.18, anstyle-query 1.1.2, clap 4.5.35, colorchoice 1.0.3, is_terminal_polyfill 1.70.1, toml_datetime 0.6.8, toml_edit 0.22.24
 
 ```
 Copyright (c) Individual contributors
@@ -7035,7 +7035,7 @@ THE SOFTWARE.
 
 ```
 
-## aho-corasick 1.1.3, jiff 0.2.5, memchr 2.7.4
+## aho-corasick 1.1.3, memchr 2.7.4
 
 ```
 The MIT License (MIT)

acknowledgments/acknowledgments-ios.plist

@@ -6237,7 +6237,7 @@ SOFTWARE.
 			<key>License</key>
 			<string>MIT License</string>
 			<key>Title</key>
-			<string>anstream 0.6.18, anstyle-query 1.1.2, clap 4.5.35, colorchoice 1.0.3, env_filter 0.1.3, env_logger 0.11.8, is_terminal_polyfill 1.70.1, toml_datetime 0.6.8, toml_edit 0.22.24</string>
+			<string>anstream 0.6.18, anstyle-query 1.1.2, clap 4.5.35, colorchoice 1.0.3, is_terminal_polyfill 1.70.1, toml_datetime 0.6.8, toml_edit 0.22.24</string>
 			<key>Type</key>
 			<string>PSGroupSpecifier</string>
 		</dict>
@@ -7183,7 +7183,7 @@ THE SOFTWARE.
 			<key>License</key>
 			<string>MIT License</string>
 			<key>Title</key>
-			<string>aho-corasick 1.1.3, jiff 0.2.5, memchr 2.7.4</string>
+			<string>aho-corasick 1.1.3, memchr 2.7.4</string>
 			<key>Type</key>
 			<string>PSGroupSpecifier</string>
 		</dict>

rust/message-backup/Cargo.toml

@@ -19,6 +19,10 @@ json = ["dep:serde_json", "dep:protobuf-json-mapping"]
 scramble = ["dep:rand"]
 test-util = []
 
+[[bin]]
+name = "validator"
+required-features = ["env_logger"]
+
 [[example]]
 name = "json_to_binproto"
 required-features = ["json"]
@@ -29,7 +33,7 @@ required-features = ["json"]
 
 [[example]]
 name = "scramble"
-required-features = ["scramble"]
+required-features = ["scramble", "env_logger"]
 
 [[bench]]
 name = "validation"
@@ -58,7 +62,7 @@ clap-stdin = { workspace = true }
 derive-where = { workspace = true }
 derive_more = { workspace = true, features = ["from", "into_iterator", "try_from"] }
 displaydoc = { workspace = true }
-env_logger = { workspace = true }
+env_logger = { workspace = true, optional = true }
 futures = { workspace = true }
 hex = { workspace = true, features = ["serde"] }
 hkdf = { workspace = true }