chore(crypto): Remove the indoc dep.

`indoc` is used once to declare a string, but it's easily doable with
pure Rust without too much boilerplate. Let's remove one macro dep.

Cargo.lock

@@ -3217,7 +3217,6 @@ dependencies = [
  "hkdf",
  "hmac",
  "http",
- "indoc",
  "insta",
  "itertools 0.14.0",
  "js_option",

crates/matrix-sdk-crypto/Cargo.toml

@@ -90,7 +90,6 @@ assert_matches.workspace = true
 assert_matches2.workspace = true
 futures-executor.workspace = true
 http.workspace = true
-indoc = "2.0.7"
 insta.workspace = true
 matrix-sdk-test.workspace = true
 matrix-sdk-test-utils.workspace = true

crates/matrix-sdk-crypto/src/file_encryption/key_export.rs

@@ -234,7 +234,6 @@ mod tests {
         io::Cursor,
     };
 
-    use indoc::indoc;
     use matrix_sdk_test::async_test;
     use ruma::{room_id, user_id};
 
@@ -249,22 +248,22 @@ mod tests {
 
     const PASSPHRASE: &str = "1234";
 
-    const TEST_EXPORT: &str = indoc! {"
-        -----BEGIN MEGOLM SESSION DATA-----
-        Af7mGhlzQ+eGvHu93u0YXd3D/+vYMs3E7gQqOhuCtkvGAAAAASH7pEdWvFyAP1JUisAcpEo
-        Xke2Q7Kr9hVl/SCc6jXBNeJCZcrUbUV4D/tRQIl3E9L4fOk928YI1J+3z96qiH0uE7hpsCI
-        CkHKwjPU+0XTzFdIk1X8H7sZ+MD/2Sg/q3y8rtUjz7uEj4GUTnb+9SCOTVmJsRfqgUpM1CU
-        bDLytHf1JkohY4tWEgpsCc67xdzgodjr12qYrfg/zNm3LGpxlrffJknw4rk5QFTj4kMbqbD
-        ZZgDTni+HxRTDGge2J620lMOiznvXX+H09Rwruqx5aJvvaaKd86jWRpiO2oSFqHn4u5ONl9
-        41uzm62Sj0eIm6ZbA9NQs87jQw4LxsejhZVL+NdjIg80zVSBTWhTdo0DTnbFSNP4ReOiz0U
-        XosOF8A5T8Vdx2nvA0GXltfcHKVKQYh/LJAkNQ7P9UYL4ae/5TtQZkhB1KxCLTRWqADCl53
-        uBMGpG53EMgY6G6K2DEIOkcv7sdXQF5WpemiSWZqJRWj+cjfs9BpCTbkp/rszWFl2TniWpR
-        RqIbT2jORlN4rTvdtF0F4z1pqP4qWyR3sLNTkXm9CFRzWADNG0RDZKxbCoo6RPvtaCTfaHo
-        SwfvzBS6CjfAG+FOugpV48o7+XetaUUPZ6/tZSPhCdeV8eP9q5r0QwWeXFogzoNzWt4HYx9
-        MdXxzD+f0mtg5gzehrrEEARwI2bCvPpHxlt/Na9oW/GBpkjwR1LSKgg4CtpRyWngPjdEKpZ
-        GYW19pdjg0qdXNk/eqZsQTsNWVo6A
-        -----END MEGOLM SESSION DATA-----
-    "};
+    const TEST_EXPORT: &str = "\
+        -----BEGIN MEGOLM SESSION DATA-----\n\
+        Af7mGhlzQ+eGvHu93u0YXd3D/+vYMs3E7gQqOhuCtkvGAAAAASH7pEdWvFyAP1JUisAcpEo\n\
+        Xke2Q7Kr9hVl/SCc6jXBNeJCZcrUbUV4D/tRQIl3E9L4fOk928YI1J+3z96qiH0uE7hpsCI\n\
+        CkHKwjPU+0XTzFdIk1X8H7sZ+MD/2Sg/q3y8rtUjz7uEj4GUTnb+9SCOTVmJsRfqgUpM1CU\n\
+        bDLytHf1JkohY4tWEgpsCc67xdzgodjr12qYrfg/zNm3LGpxlrffJknw4rk5QFTj4kMbqbD\n\
+        ZZgDTni+HxRTDGge2J620lMOiznvXX+H09Rwruqx5aJvvaaKd86jWRpiO2oSFqHn4u5ONl9\n\
+        41uzm62Sj0eIm6ZbA9NQs87jQw4LxsejhZVL+NdjIg80zVSBTWhTdo0DTnbFSNP4ReOiz0U\n\
+        XosOF8A5T8Vdx2nvA0GXltfcHKVKQYh/LJAkNQ7P9UYL4ae/5TtQZkhB1KxCLTRWqADCl53\n\
+        uBMGpG53EMgY6G6K2DEIOkcv7sdXQF5WpemiSWZqJRWj+cjfs9BpCTbkp/rszWFl2TniWpR\n\
+        RqIbT2jORlN4rTvdtF0F4z1pqP4qWyR3sLNTkXm9CFRzWADNG0RDZKxbCoo6RPvtaCTfaHo\n\
+        SwfvzBS6CjfAG+FOugpV48o7+XetaUUPZ6/tZSPhCdeV8eP9q5r0QwWeXFogzoNzWt4HYx9\n\
+        MdXxzD+f0mtg5gzehrrEEARwI2bCvPpHxlt/Na9oW/GBpkjwR1LSKgg4CtpRyWngPjdEKpZ\n\
+        GYW19pdjg0qdXNk/eqZsQTsNWVo6A\n\
+        -----END MEGOLM SESSION DATA-----\
+    ";
 
     fn export_without_headers() -> String {
         TEST_EXPORT.lines().filter(|l| !l.starts_with("-----")).collect()