fix(deps): update dependency google/cloud-functions-framework to ^0.7 (GoogleCloudPlatform#1284)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [google/cloud-functions-framework](https://togithub.com/GoogleCloudPlatform/functions-framework-php) | require | minor | `^0.6` -> `^0.7` |

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### Release Notes

<details>
<summary>GoogleCloudPlatform/functions-framework-php</summary>

### [`v0.7.1`](https://togithub.com/GoogleCloudPlatform/functions-framework-php/releases/v0.7.1)

[Compare Source](https://togithub.com/GoogleCloudPlatform/functions-framework-php/compare/v0.7.0...v0.7.1)

#### Bug Fixes

-   allow array data when parsing binary event ([#&#8203;63](https://togithub.com/GoogleCloudPlatform/functions-framework-php/issues/63))

### [`v0.7.0`](https://togithub.com/GoogleCloudPlatform/functions-framework-php/releases/v0.7.0)

[Compare Source](https://togithub.com/GoogleCloudPlatform/functions-framework-php/compare/v0.6.0...v0.7.0)

##### Features

-   add handling for exceptions ([#&#8203;62](https://togithub.com/GoogleCloudPlatform/functions-framework-php/issues/62))
-   add support for structured events ([#&#8203;59](https://togithub.com/GoogleCloudPlatform/functions-framework-php/issues/59))

</details>

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functions/slack_slash_command/composer.json

@@ -1,6 +1,6 @@
 {
     "require": {
-        "google/cloud-functions-framework": "^0.6",
+        "google/cloud-functions-framework": "^0.7",
         "google/apiclient": "^2.8"
     },
     "scripts": {